Unhardcoding cd-docker-hub.yml (alexjustesen#316)

Author: UnAfraid

.github/workflows/cd-docker-hub.yml

@@ -16,8 +16,6 @@ on:
     types: [ published ]
 
 env:
-  REGISTRY: ajustesen
-  IMAGE_NAME: ${{ github.repository }}
   PLATFORMS: linux/amd64,linux/arm64,linux/arm/v7
 
 jobs:
@@ -40,17 +38,21 @@ jobs:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
 
+      - id: docker-image-to-lowercase
+        name: Convert Docker image to lower case
+        run: echo "DOCKER_IMAGE=$(echo ${{ secrets.DOCKER_USERNAME }}/${{ github.event.repository.name }} | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV
+
       - name: Extract metadata (tags, labels) for Docker
         id: meta
         uses: docker/metadata-action@v4
         with:
-          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          images: ${{ env.DOCKER_IMAGE }}
 
       - name: Build and push image to Docker Hub
         uses: docker/build-push-action@v3
         with:
           context: .
           push: true
           platforms: ${{ env.PLATFORMS }}
-          tags: ajustesen/speedtest-tracker:latest
+          tags: ${{ env.DOCKER_IMAGE }}:latest
           labels: ${{ steps.meta.outputs.labels }}