feat: add healthcheck

Signed-off-by: rare-magma <rare-magma@posteo.eu>

Dockerfile

@@ -8,13 +8,17 @@ COPY . .
 
 RUN npx tailwindcss -i static/tailwind.css -o static/app.css -m
 RUN go mod download
-RUN GOOS=linux GOARCH=$TARGETARCH CGO_ENABLED=0 go build -ldflags "-X codeberg.org/rimgo/rimgo/pages.VersionInfo=$(date '+%Y-%m-%d')-$(git rev-list --abbrev-commit -1 HEAD)"
+RUN GOOS=linux GOARCH=$TARGETARCH CGO_ENABLED=0 go build -ldflags "-X codeberg.org/rimgo/rimgo/pages.VersionInfo=$(date '+%Y-%m-%d')-$(git rev-list --abbrev-commit -1 HEAD)" \
+    && GOOS=linux GOARCH=$TARGETARCH CGO_ENABLED=0 go build -o healthcheck ./healthcheck
 
 FROM scratch as bin
 
 WORKDIR /app
 COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
 COPY --from=build /src/rimgo .
+COPY --from=build /src/healthcheck .
+
+HEALTHCHECK --interval=60s --timeout=5s --start-period=2s --retries=3 CMD [ "/healthcheck","http://localhost:3000/livez" ]
 
 EXPOSE 3000
 

healthcheck/heathcheck.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+)
+
+func main() {
+	if len(os.Args) < 2 {
+		log.Fatal("Expected URL as command-line argument")
+		os.Exit(1)
+	}
+	url := os.Args[1]
+	fmt.Println(url)
+	if _, err := http.Get(url); err != nil {
+		os.Exit(1)
+	}
+}

main.go

@@ -11,13 +11,14 @@ import (
 	"codeberg.org/rimgo/rimgo/static"
 	"codeberg.org/rimgo/rimgo/utils"
 	"codeberg.org/rimgo/rimgo/views"
-	"github.com/mailgun/raymond/v2"
 	"github.com/gofiber/fiber/v2"
 	"github.com/gofiber/fiber/v2/middleware/cache"
 	"github.com/gofiber/fiber/v2/middleware/filesystem"
+	"github.com/gofiber/fiber/v2/middleware/healthcheck"
 	"github.com/gofiber/fiber/v2/middleware/recover"
 	"github.com/gofiber/template/handlebars/v2"
 	"github.com/joho/godotenv"
+	"github.com/mailgun/raymond/v2"
 )
 
 func main() {
@@ -56,6 +57,7 @@ func main() {
 		},
 	})
 
+	app.Use(healthcheck.New())
 	app.Use(recover.New(recover.Config{
 		EnableStackTrace: true,
 		StackTraceHandler: func(c *fiber.Ctx, e interface{}) {