feat: implement Live/Remix filtering and add CI/CD pipeline

This commit includes:

1. Live/Remix Filtering Feature:
   - Added ignore_live and ignore_remix columns to artist_settings table (migration 010)
   - Updated ArtistSettings struct with IgnoreLive and IgnoreRemix fields
   - Modified SaveArtistSettings and UpdateArtistSettings to handle new fields
   - Extended FilterOptions struct with IgnoreLive and IgnoreRemix
   - Updated ApplyTypeToggles and ApplyTypeTogglesToReleaseGroups to filter Live/Remix types
   - Added toggleIgnoreLive and toggleIgnoreRemix handlers in web layer
   - Updated ArtistData view model and artist.html template with new toggle UI
   - Comprehensive test coverage for all new functionality

2. CI/CD Pipeline with Gitea Actions:
   - Added .gitea/workflows/docker-build.yml for automated Docker builds
   - Workflow triggers on pushes to main/master and tags, plus PRs
   - Runs Go tests before building
   - Builds and pushes multi-architecture Docker images to gitea.mrixs.me
   - Includes caching for faster subsequent builds
   - Proper tagging strategy (branch, semver, SHA)
   - CI-CD-GUIDE.md documentation

3. Cleanup:
   - Removed temporary build artifacts and coverage files

internal/database/database.go

@@ -15,6 +15,12 @@ type DB struct {
 	conn *sql.DB
 }
 
+// DBer is the minimal query interface satisfied by both *sql.DB and *sql.Tx,
+// so callers can run statements inside or outside a transaction.
+type DBer interface {
+	Exec(query string, args ...interface{}) (sql.Result, error)
+}
+
 // ErrArtistNotFound is returned by artist lookups when no row matches the given
 // ID. It is a sentinel so callers (e.g. the web UI) can distinguish "missing"
 // from other errors.
@@ -164,6 +170,11 @@ func (db *DB) migrate() error {
 			name: "009_add_last_synced_to_artist_settings",
 			sql:  `ALTER TABLE artist_settings ADD COLUMN last_synced DATETIME;`,
 		},
+		{
+			name: "010_add_ignore_live_ignore_remix_to_artist_settings",
+			sql:  `ALTER TABLE artist_settings ADD COLUMN ignore_live BOOLEAN DEFAULT 0;
+				  ALTER TABLE artist_settings ADD COLUMN ignore_remix BOOLEAN DEFAULT 0;`,
+		},
 	}
 
 	for _, m := range migrations {
@@ -215,6 +226,8 @@ type ArtistSettings struct {
 	MBID               string    `json:"mbid"`
 	IgnoreSingles      bool      `json:"ignore_singles"`
 	IgnoreCompilations bool      `json:"ignore_compilations"`
+	IgnoreLive         bool      `json:"ignore_live"`
+	IgnoreRemix        bool      `json:"ignore_remix"`
 	Monitored          bool      `json:"monitored"`
 	LastSynced         time.Time `json:"last_synced"`
 }