[chore] Print human readable config (#1589)

This changes the config action to print the config in a more human
readable format, indented by 4 spaces and with newlines.

Thanks to this, we can now reasonably construct some JSON in the
envparsing shell script, without needing utilities like jd. It does
assume cat is available in order to not change the shebang to bash.

With the expected JSON now being one key per line it should make it much
easier for multiple PRs that change something around config not to
collide in merge conflicts.

cmd/gotosocial/action/debug/config/config.go

@@ -21,7 +21,7 @@ package config
 import (
 	"context"
 	"encoding/json"
-	"fmt"
+	"os"
 
 	"github.com/superseriousbusiness/gotosocial/cmd/gotosocial/action"
 	"github.com/superseriousbusiness/gotosocial/internal/config"
@@ -39,13 +39,8 @@ var Config action.GTSAction = func(ctx context.Context) (err error) {
 		return err
 	}
 
-	// Marshal map to JSON
-	b, err := json.Marshal(raw)
-	if err != nil {
-		return err
-	}
-
-	// Print to stdout
-	fmt.Printf("%s\n", b)
-	return nil
+	enc := json.NewEncoder(os.Stdout)
+	enc.SetIndent("", "    ")
+	err = enc.Encode(raw)
+	return err
 }