Add healthcheck endpoint (#170)

internal/web/healthcheck.go

@@ -0,0 +1,24 @@
+package web
+
+import (
+	"github.com/labstack/echo/v4"
+	"github.com/thomiceli/opengist/internal/db"
+	"time"
+)
+
+func healthcheck(ctx echo.Context) error {
+	// Check database connection
+	dbOk := "ok"
+	httpStatus := 200
+
+	err := db.Ping()
+	if err != nil {
+		dbOk = "ko"
+		httpStatus = 503
+	}
+
+	return ctx.JSON(httpStatus, map[string]interface{}{
+		"database": dbOk,
+		"time":     time.Now().Format(time.RFC3339),
+	})
+}