chore: No longer push to Docker Hub on release

No longer push to Docker Hub on release as per kedacore/governance#16

Signed-off-by: Tom Kerkhove <kerkhove.tom@gmail.com>

.github/workflows/release-build.yml

@@ -51,12 +51,6 @@ jobs:
           # Server address of Docker registry. If not set then will default to Docker Hub
           registry: ghcr.io
 
-      - name: Login to Docker Hub
-        env:
-          DOCKER_HUB_ACCESS_TOKEN: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
-          DOCKER_HUB_USERNAME: ${{ secrets.DOCKER_HUB_USERNAME }}
-        run: echo $DOCKER_HUB_ACCESS_TOKEN | docker login -u $DOCKER_HUB_USERNAME --password-stdin
-
       - name: Get the version
         id: get_version
         run: echo ::set-output name=VERSION::${GITHUB_REF#refs/tags/v}
@@ -86,11 +80,6 @@ jobs:
         env:
           VERSION: ${{ steps.get_version.outputs.VERSION }}
 
-      - name: Publish KEDA images on Docker Hub
-        run: make publish-dockerhub
-        env:
-          VERSION: ${{ steps.get_version.outputs.VERSION }}
-
         # Get release information to determine id of the current release
       - name: Get Release
         id: get-release-info