Bump Go version in Dockerfile

.github/workflows/docker-image.yml

@@ -2,7 +2,8 @@ name: build and publish a Docker image
 
 on:
   push:
-    branches: ['master']
+    tags:
+      - 'v*'
 
 env:
   REGISTRY: ghcr.io
@@ -20,22 +21,20 @@ jobs:
         uses: actions/checkout@v3
 
       - name: Log in to the Container registry
-        uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
+        uses: docker/login-action@v2
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Extract metadata (tags, labels) for Docker
+      - name: Extract metadata 
         id: meta
-        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
+        uses: docker/metadata-action@9v4
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
-          tags: |
-            type=raw,latest
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
+        uses: docker/build-push-action@v4
         with:
           context: .
           push: true

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.19-alpine
+FROM golang:1.20-alpine
 
 LABEL org.opencontainers.image.source = "https://github.com/denyskon/teabag"