Updated to use vars for docker hub user

Author: stevehipwell

.github/workflows/commit.yaml

@@ -152,7 +152,7 @@ jobs:
       - name: Login to DockerHub
         uses: docker/login-action@f4ef78c080cd8ba55a85445d5b36e214a81df20a # v2.1.0
         with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          username: ${{ vars.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Push OCI image tags

.github/workflows/release.yaml

@@ -160,7 +160,7 @@ jobs:
       - name: Login to DockerHub
         uses: docker/login-action@f4ef78c080cd8ba55a85445d5b36e214a81df20a # v2.1.0
         with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          username: ${{ vars.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Push OCI image tags
@@ -230,7 +230,7 @@ jobs:
       - name: Update Docker repository description
         uses: peter-evans/dockerhub-description@93b93397c27ed52b4055b8c6b2f8d92456ab3c56 # v3.1.2
         with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          username: ${{ vars.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
           repository: ${{ github.repository }}