fix: workflow for Systemec use

.github/workflows/docker-build.yml

@@ -13,7 +13,7 @@ on:
     types: [published]
 
 env:
-  IMAGE_NAME: paessler/multi-platform-probe
+  IMAGE_NAME: prtgprobe/multi-platform-probe
 
 jobs:
   docker_build:
@@ -28,17 +28,13 @@ jobs:
       fail-fast: false
       matrix:
         variant:
-          - name: dockerhub
-            registry: "docker.io"
-          - name: ghcr
-            registry: "ghcr.io"
+          - name: systemec_piraeus
+            registry: "piraeus.systemec.nl"
     steps:
       - name: Set image for Docker
         id: set-image
         run: |
-          if [ "${{ matrix.variant.name }}" = "ghcr" ]; then
-            echo "IMAGE_TO_USE=${GITHUB_REPOSITORY}" >> $GITHUB_ENV
-          elif [ "${{ matrix.variant.name }}" == "dockerhub" ]; then
+          if [ "${{ matrix.variant.name }}" == "systemec_piraeus" ]; then
             echo "IMAGE_TO_USE=${IMAGE_NAME}" >> $GITHUB_ENV
           else
             echo "Failing to resolve."
@@ -60,21 +56,13 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: Log in to Docker Hub
-        if: matrix.variant.name == 'dockerhub'
+        if: matrix.variant.name == 'systemec_piraeus'
         uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PUSH_TOKEN }}
           registry: ${{ matrix.variant.registry }}
 
-      - name: Log in to Github Container Registry
-        if: matrix.variant.name == 'ghcr'
-        uses: docker/login-action@v3
-        with:
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-          registry: ${{ matrix.variant.registry }}
-
       - name: Extract metadata (tags, labels) for Docker
         id: meta
         uses: docker/metadata-action@v5
@@ -95,19 +83,3 @@ jobs:
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
           platforms: linux/amd64,linux/arm64,linux/arm/v7
-
-      - name: Generate artifact attestation
-        if: matrix.variant.name == 'dockerhub'
-        uses: actions/attest-build-provenance@v1
-        with:
-          subject-name: ${{ matrix.variant.registry }}/${{ env.IMAGE_NAME }}
-          subject-digest: ${{ steps.push.outputs.digest }}
-          push-to-registry: true
-
-      - name: Generate artifact attestation
-        if: matrix.variant.name == 'ghcr'
-        uses: actions/attest-build-provenance@v1
-        with:
-          subject-name: ${{ matrix.variant.registry }}/${{ github.repository }}
-          subject-digest: ${{ steps.push.outputs.digest }}
-          push-to-registry: true