fix: Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-ALPINE315-OPENSSL-5661569
- https://snyk.io/vuln/SNYK-ALPINE315-OPENSSL-5661569

.github/workflows/release.yml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           token: ${{ secrets.API_GITHUB_TOKEN }}
 
@@ -28,19 +28,19 @@ jobs:
             alpine
 
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v1
+        uses: docker/setup-qemu-action@v2
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1
+        uses: docker/setup-buildx-action@v2
 
       - name: Login to DockerHub
-        uses: docker/login-action@v1
+        uses: docker/login-action@v2
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
 
       - name: Build and push
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v3.3.1
         with:
           push: true
           platforms: linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64

.github/workflows/test.yml

@@ -13,23 +13,23 @@ jobs:
     steps:
       - name: Checkout with token
         if: github.event_name != 'pull_request'
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           token: ${{ secrets.API_GITHUB_TOKEN }}
 
       - name: Checkout without token
         if: github.event_name == 'pull_request'
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1
+        uses: docker/setup-buildx-action@v2
 
       - name: Docker Build Test
         run: docker buildx build --load --tag test:test --file ./Dockerfile ./
 
       - name: Version
         if: github.event_name != 'pull_request'
-        uses: cycjimmy/semantic-release-action@v2.5.3
+        uses: cycjimmy/semantic-release-action@v3
         with:
           semantic_version: 17.4
         env:

Dockerfile

@@ -1,5 +1,5 @@
 #Dockerfile for a Postfix email relay service
-FROM alpine:3.15
+FROM alpine:3
 MAINTAINER Juan Luis Baptiste juan.baptiste@gmail.com
 
 RUN apk update && \