server: env-driven config via dotenv; Dockerfile BuildKit cache mounts; db in data.volume

Dockerfile

@@ -24,7 +24,8 @@ RUN apk add --no-cache ca-certificates tzdata
 WORKDIR /app
 COPY --from=backend /out/statuspage /app/statuspage
 COPY --from=frontend /ui/dist /app/dist
+ENV CONFIG=/app/config.local.yaml
 VOLUME /app/data.volume
 EXPOSE 5000
 ENTRYPOINT ["/app/statuspage"]
-CMD ["-c", "/app/config.local.yaml", "--addr", ":5000"]
+CMD ["--addr", ":5000"]

docker-compose.yml

@@ -7,6 +7,9 @@ services:
     volumes:
       - ./data.volume:/app/data.volume
       - ./config.local.yaml:/app/config.local.yaml:ro
+    environment:
+      - CONFIG=/app/config.local.yaml
+      - ADDR=:5000
     cap_add:
       - NET_RAW
     restart: unless-stopped

go.mod

@@ -3,13 +3,12 @@ module statuspage
 go 1.26.4
 
 require (
+	github.com/joho/godotenv v1.5.1
+	github.com/mattn/go-sqlite3 v1.14.49
+	github.com/spf13/pflag v1.0.10
 	golang.org/x/crypto v0.54.0
 	golang.org/x/net v0.57.0
 	gopkg.in/yaml.v3 v3.0.1
 )
 
-require (
-	github.com/mattn/go-sqlite3 v1.14.49 // indirect
-	github.com/spf13/pflag v1.0.10 // indirect
-	golang.org/x/sys v0.47.0 // indirect
-)
+require golang.org/x/sys v0.47.0 // indirect

go.sum

@@ -1,3 +1,5 @@
+github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
+github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
 github.com/mattn/go-sqlite3 v1.14.49 h1:B8jBHC3xhxZgxztrgruTuLucebnULQnx4W7cF7SAE9w=
 github.com/mattn/go-sqlite3 v1.14.49/go.mod h1:6JTjA44L93a0QCyJef5YvlPoKXntQPjzWv5gtm9sB6w=
 github.com/spf13/pflag v1.0.10 h1:4EBh2KAYBwaONj6b2Ye1GiHfwjqyROoF4RwYO+vPwFk=

server/main.go

@@ -9,9 +9,17 @@ import (
 	"path/filepath"
 	"strings"
 
+	"github.com/joho/godotenv"
 	"github.com/spf13/pflag"
 )
 
+func envOr(key, def string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	return def
+}
+
 func buildFrontend() error {
 	cmd := "npm"
 	if _, err := exec.LookPath("npm"); err != nil {
@@ -43,11 +51,13 @@ func spaHandler() http.HandlerFunc {
 }
 
 func main() {
+	_ = godotenv.Load()
+
 	dev := pflag.Bool("dev", false, "run `npm run build` before serving dist/")
 	devServer := pflag.Bool("dev-server", false, "frontend served by the vite dev server, do not serve dist/")
-	addr := pflag.String("addr", ":5000", "listen address")
-	configPath := pflag.StringP("config", "c", "config.local.yaml", "yaml config file")
-	dbPath := pflag.String("db", "data.volume/history.db", "sqlite history database file")
+	addr := pflag.String("addr", envOr("ADDR", ":5000"), "listen address")
+	configPath := pflag.StringP("config", "c", envOr("CONFIG", "config.local.yaml"), "yaml config file")
+	dbPath := pflag.String("db", envOr("DB", "data.volume/history.db"), "sqlite history database file")
 	pflag.Parse()
 
 	if dir := filepath.Dir(*dbPath); dir != "." {