[chore] upgrade golangci-lint to v2.1.6 and migrate config (#4265)

Signed-off-by: nicole mikołajczyk <git@mkljczk.pl>

# Description

Contribution guidelines link to the golangci-lint documentation for the up-to-date version rather than [the legacy v1 doc](https://golangci.github.io/legacy-v1-doc/), which uses a different configuration schema. I migrated the config using the `golangci-lint migrate` command, moved the comments, adjusted staticcheck config and ensured the rules still work.

## Checklist

- [x] I/we have read the [GoToSocial contribution guidelines](https://codeberg.org/superseriousbusiness/gotosocial/src/branch/main/CONTRIBUTING.md).
- [ ] I/we have discussed the proposed changes already, either in an issue on the repository, or in the Matrix chat.
- [x] I/we have not leveraged AI to create the proposed changes.
- [ ] I/we have performed a self-review of added code.
- [x] I/we have written code that is legible and maintainable by others.
- [ ] I/we have commented the added code, particularly in hard-to-understand areas.
- [ ] I/we have made any necessary changes to documentation.
- [ ] I/we have added tests that cover new code.
- [ ] I/we have run tests and they pass locally with the changes.
- [ ] I/we have run `go fmt ./...` and `golangci-lint run`.

Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4265
Co-authored-by: nicole mikołajczyk <git@mkljczk.pl>
Co-committed-by: nicole mikołajczyk <git@mkljczk.pl>

.golangci.yml

@@ -4,91 +4,92 @@
 #
 # For GoToSocial we mostly take the default linters, but we add a few to catch style issues as well.
 
+version: "2"
 # options for analysis running
 run:
   # include test files or not, default is true
   tests: false
-  # timeout for analysis, e.g. 30s, 5m, default is 1m
-  timeout: 5m
-
 linters:
   # enable some extra linters, see here for the list: https://golangci-lint.run/usage/linters/
   enable:
     - gocritic
-    - gofmt
     - goheader
     - gosec
     - nilerr
     - revive
+  # https://golangci-lint.run/usage/linters/#linters-configuration
+  settings:
+    # https://golangci-lint.run/usage/linters/#goheader
+    goheader:
+      template: |-
+        GoToSocial
+        Copyright (C) GoToSocial Authors admin@gotosocial.org
+        SPDX-License-Identifier: AGPL-3.0-or-later
 
-# https://golangci-lint.run/usage/linters/#linters-configuration
+        This program is free software: you can redistribute it and/or modify
-linters-settings:
+        it under the terms of the GNU Affero General Public License as published by
-  # https://golangci-lint.run/usage/linters/#goheader
+        the Free Software Foundation, either version 3 of the License, or
-  goheader:
+        (at your option) any later version.
-    template: |-
-      GoToSocial
-      Copyright (C) GoToSocial Authors admin@gotosocial.org
-      SPDX-License-Identifier: AGPL-3.0-or-later
-      
-      This program is free software: you can redistribute it and/or modify
-      it under the terms of the GNU Affero General Public License as published by
-      the Free Software Foundation, either version 3 of the License, or
-      (at your option) any later version.
 
-      This program is distributed in the hope that it will be useful,
+        This program is distributed in the hope that it will be useful,
-      but WITHOUT ANY WARRANTY; without even the implied warranty of
+        but WITHOUT ANY WARRANTY; without even the implied warranty of
-      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-      GNU Affero General Public License for more details.
+        GNU Affero General Public License for more details.
 
-      You should have received a copy of the GNU Affero General Public License
+        You should have received a copy of the GNU Affero General Public License
-      along with this program.  If not, see <http://www.gnu.org/licenses/>.
+        along with this program.  If not, see <http://www.gnu.org/licenses/>.
-  # https://golangci-lint.run/usage/linters/#govet
+    # https://golangci-lint.run/usage/linters/#govet
-  govet:
+    govet:
-    disable:
+      disable:
-      - composites
+        - composites
-  # https://golangci-lint.run/usage/linters/#revive
+    # https://golangci-lint.run/usage/linters/#revive
-  revive:
+    revive:
-    rules:
+      rules:
-      # Enable most default rules.
+        # Enable most default rules.
-      # See: https://github.com/mgechev/revive/blob/master/defaults.toml
+        # See: https://github.com/mgechev/revive/blob/master/defaults.toml
-      - name: blank-imports
+        - name: blank-imports
-      - name: context-as-argument
+        - name: context-as-argument
-      - name: context-keys-type
+        - name: context-keys-type
-      - name: dot-imports
+        - name: dot-imports
-      - name: error-naming
+        - name: error-naming
-      - name: error-return
+        - name: error-return
-      - name: error-strings
+        - name: error-strings
-      - name: exported
+        - name: exported
-      - name: if-return
+        - name: if-return
-      - name: increment-decrement
+        - name: increment-decrement
-      - name: var-naming
+        - name: var-naming
-      - name: var-declaration
+        - name: var-declaration
-      - name: package-comments
+        - name: package-comments
-      - name: range
+        - name: range
-      - name: receiver-naming
+        - name: receiver-naming
-      - name: time-naming
+        - name: time-naming
-      - name: unexported-return
+        - name: unexported-return
-      - name: indent-error-flow
+        - name: indent-error-flow
-      - name: errorf
+        - name: errorf
-      - name: empty-block
+        - name: empty-block
-      - name: superfluous-else
+        - name: superfluous-else
-      - name: unreachable-code
+        - name: unreachable-code
-      # Disable below rules.
+        # Disable below rules.
-      - name: redefines-builtin-id 
+        - name: redefines-builtin-id
-        disabled: true # This one is just annoying.
+          disabled: true
-      - name: unused-parameter     
+        - name: unused-parameter
-        disabled: true # We often pass parameters to fulfil interfaces.
+          disabled: true
-  # https://golangci-lint.run/usage/linters/#staticcheck
+    # https://golangci-lint.run/usage/linters/#staticcheck
-  staticcheck:
+    staticcheck:
-    # Enable all checks, but disable SA1012: nil context passing.
+      # Enable all checks, but disable SA1012: nil context passing.
-    # See: https://staticcheck.io/docs/configuration/options/#checks
+      # See: https://staticcheck.io/docs/configuration/options/#checks
-    checks: ["all", "-SA1012"]
+      checks:
-
+        - SA*
-issues:
+        - -SA1012
-  exclude-rules:
+  exclusions:
-    # Exclude VSCode custom folding region comments in files that use them.
+    generated: lax
-    # Already fixed in go-critic and can be removed next time go-critic is updated.
+    presets:
-    - linters:
+      - comments
-        - gocritic
+      - common-false-positives
-      path: internal/db/filter.go
+      - legacy
-      text: 'commentFormatting: put a space between `//` and comment text'
+      - std-error-handling
+formatters:
+  enable:
+    - gofmt
+  exclusions:
+    generated: lax

.woodpecker/pr.yaml

@@ -22,7 +22,7 @@ steps:
 
     # We use golangci-lint for linting.
     # See: https://golangci-lint.run/
-    image: golangci/golangci-lint:v1.64.8
+    image: golangci/golangci-lint:v2.1.6
     pull: true
 
     # https://woodpecker-ci.org/docs/administration/configuration/backends/docker#run-user