Update alpine Docker tag to v3.22

Dockerfile

@@ -25,7 +25,7 @@ RUN templ generate
 RUN CGO_ENABLED=1 GOOS=linux go build -a -installsuffix cgo -ldflags '-extldflags "-static"' -o tankstopp ./cmd/main.go
 
 # Stage 2: Runtime stage
-FROM alpine:3.18
+FROM alpine:3.22
 
 # Install runtime dependencies
 RUN apk add --no-cache \

docker-compose.prod.yml

@@ -91,7 +91,7 @@ services:
 
   # Database backup service
   backup:
-    image: alpine:3.18
+    image: alpine:3.22
     container_name: tankstopp-backup
     restart: "no"
     environment: