reduce number of plattforms in normal push

.github/workflows/docker.yml

@@ -1,31 +1,35 @@
 name: docker
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
 
 jobs:
   docker:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - name: Checkout
+        uses: actions/checkout@v2
       - name: Set versions env var
         run: sed -n -e 's/.*\(VZLOGGER_.*_VERSION\) \+\([0-9]\+\).*/\1=\2/p' CMakeLists.txt >> $GITHUB_ENV
       - name: Set env sha short
-        run: echo "GITHUB_SHA_SHORT=$(echo $GITHUB_SHA | cut -c 1-6)" >> $GITHUB_ENV
+        run: echo "GITHUB_SHA_SHORT=$(git rev-parse --short HEAD)" >> $GITHUB_ENV
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v1
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
       - name: Login to DockerHub
-        uses: docker/login-action@v1 
+        uses: docker/login-action@v1
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
       - name: Build
         uses: docker/build-push-action@v2
         with:
-          push: ${{ github.ref == 'refs/heads/master' }}
-          platforms: linux/amd64,linux/arm64,linux/arm/v7,linux/arm/v6
+          push: true
+          platforms: linux/amd64,linux/arm/v6
           tags: ${{ env.image_name }}:commit-${{ env.GITHUB_SHA_SHORT }}, ${{ env.image_name }}:${{ env.VZLOGGER_MAJOR_VERSION }}.${{ env.VZLOGGER_MINOR_VERSION }}.${{ env.VZLOGGER_SUB_VERSION }}, ${{ env.image_name }}:${{ env.VZLOGGER_MAJOR_VERSION }}.${{ env.VZLOGGER_MINOR_VERSION }}, ${{ env.image_name }}:${{ env.VZLOGGER_MAJOR_VERSION }}, ${{ env.image_name }}:latest
         env:
           image_name: ${{ secrets.DOCKERHUB_USERNAME }}/vzlogger