Update username/password env vars. Use repository secret rather than env.

Author: featheredtoast

.github/workflows/build.yml

@@ -13,7 +13,6 @@ env:
 jobs:
   push:
     if: (github.ref == 'refs/heads/main')
-    environment: docker push
     runs-on: ubuntu-latest
     strategy:
       matrix:
@@ -25,7 +24,7 @@ jobs:
       - uses: docker/setup-buildx-action@v3
       - name: build images
         run: |
-          docker login --username ${{ vars.DOCKERHUB_USERNAME }} --password ${{ secrets.DOCKER_PASSWORD }}
+          docker login --username ${{ vars.DOCKERHUB_USERNAME }} --password ${{ secrets.DOCKERHUB_PASSWORD }}
           docker buildx build --push --platform linux/amd64,linux/arm64 --tag ${{ env.DOCKER_REPO }}:pg${{ matrix.version }} --build-arg VERSION=${{ matrix.version }} .
           if [ "${{ matrix.version }}" = "${{ env.LATEST }}" ]; then
             docker buildx build --push --platform linux/amd64,linux/arm64 --tag ${{ env.DOCKER_REPO }}:latest --build-arg VERSION=${{ matrix.version }} .