ci: add Gitea Actions workflow for make check (#21)

Adds CI workflow that runs `make check` on push/PR to main.

Co-authored-by: user <user@Mac.lan guest wan>
Co-authored-by: clawbot <clawbot@eeqj.de>
Reviewed-on: #21
Co-authored-by: clawbot <sneak+clawbot@sneak.cloud>
Co-committed-by: clawbot <sneak+clawbot@sneak.cloud>

internal/secret/passphrase_test.go

@@ -24,7 +24,7 @@ func TestPassphraseUnlockerWithRealFS(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Failed to create temp dir: %v", err)
 	}
-	defer os.RemoveAll(tempDir) // Clean up after test
+	defer func() { _ = os.RemoveAll(tempDir) }() // Clean up after test
 
 	// Use the real filesystem
 	fs := afero.NewOsFs()
@@ -155,7 +155,7 @@ func TestPassphraseUnlockerWithRealFS(t *testing.T) {
 	})
 
 	// Unset the environment variable to test interactive prompt
-	os.Unsetenv(secret.EnvUnlockPassphrase)
+	_ = os.Unsetenv(secret.EnvUnlockPassphrase)
 
 	// Test getting identity from prompt (this would require mocking the prompt)
 	// For real integration tests, we'd need to provide a way to mock the passphrase input