Introducing the repository secret (#18)

* fixes #17
* corrections and adjustments

.github/workflows/close_stale_issues.yml

@@ -8,7 +8,8 @@ jobs:
   stale:
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/stale@v3
+      - name: Close stale issues
+        uses: actions/stale@v3
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
           days-before-stale: 1 # TODO just for testing purposes, otherwise (20)

.github/workflows/default_on_push.yml

@@ -53,7 +53,7 @@ jobs:
       - name: Prepare tags
         id: prep
         run: |
-          DOCKER_IMAGE=docker.io/mailserver/docker-mailserver
+          DOCKER_IMAGE=${{ secrets.DOCKER_REPOSITORY }}
           VERSION=latest
           [[ $GITHUB_REF == refs/tags/* ]] && VERSION=${GITHUB_REF#refs/tags/v}
           [[ $GITHUB_REF == 'refs/heads/stable' ]] && VERSION=stable

.github/workflows/scheduled_builds.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Prepare
         id: prep
         run: |
-          TAGS="docker.io/mailserver/docker-mailserver:stable"
+          TAGS=${{ secrets.DOCKER_REPOSITORY }}:stable
           echo ::set-output name=tags::${TAGS}
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v1
@@ -38,6 +38,5 @@ jobs:
             VCS_REF=${{ github.sha }}
             VCS_VER=${{ github.ref }}
           platforms: linux/amd64,linux/arm/v7,linux/arm64
-          pull: true
           push: true
           tags: ${{ steps.prep.outputs.tags }}