Add workflows and fix linter errors

.github/workflows/go-test-build.yaml

@@ -0,0 +1,20 @@
+name: go-test-build
+on:
+  push:
+  pull_request:
+
+jobs:
+  go-test-build:
+    runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/catthehacker/ubuntu:runner-latest
+    strategy:
+      matrix:
+        go: [ "1.22", "1.21" ]
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-go@v5
+        with:
+          go-version: ${{ matrix.go }}
+      - run: go test -v ./...
+      - run: go build -o main main.go

.github/workflows/golangci-lint.yaml

@@ -0,0 +1,19 @@
+name: golangci-lint
+on:
+  push:
+  pull_request:
+
+jobs:
+  goglangci-lint:
+    runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/catthehacker/ubuntu:runner-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.22"
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v6
+        with:
+          version: v1.61

.github/workflows/nix-check-build.yaml

@@ -0,0 +1,15 @@
+name: nix-check-build
+on:
+  push:
+  pull_request:
+
+jobs:
+  nix-check-build:
+    runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/catthehacker/ubuntu:runner-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cachix/install-nix-action@v27
+      - run: nix flake check
+      - run: nix build

.gitignore

@@ -1 +1,2 @@
+.direnv
 result

main.go

@@ -40,7 +40,10 @@ func main() {
 		panic(err)
 	}
 	defer input.Close()
-	input.NonBlock()
+	if err := input.NonBlock(); err != nil {
+		slog.Error("Failed to set non-blocking mode", "error", err)
+		os.Exit(1)
+	}
 
 	// Start metrics server
 	srvCtx, srvCancel := context.WithCancel(context.Background())
@@ -54,12 +57,14 @@ func main() {
 		}
 		go func() {
 			<-ctx.Done()
-			srv.Shutdown(context.Background())
+			_ = srv.Shutdown(context.Background())
 			srvCancel()
 		}()
 
 		slog.Info("Starting metrics server", "addr", srv.Addr)
-		srv.ListenAndServe()
+		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+			slog.Warn("Failed to start metrics server", "error", err)
+		}
 	}()
 
 	// Listen for context cancellation
@@ -84,7 +89,7 @@ func main() {
 					continue
 				}
 				slog.Error("Error reading from input device", "error", err)
-				mbus.StopTalking()
+				_ = mbus.StopTalking()
 				os.Exit(1)
 			}
 			if ev.Code == evdev.KEY_F24 && ev.Value == 1 {
@@ -104,15 +109,15 @@ func main() {
 
 	for v := range debouncer.C {
 		if v {
-			mbus.StartTalking()
+			_ = mbus.StartTalking()
 			slog.Info("Started talking")
 		} else {
-			mbus.StopTalking()
+			_ = mbus.StopTalking()
 			slog.Info("Stopped talking")
 		}
 	}
 
-	mbus.StopTalking()
+	_ = mbus.StopTalking()
 	<-srvCtx.Done()
 	slog.Info("Exiting")
 }