no access to secrets on pull requests

Author: jhunsaker

.github/workflows/docker.yaml

@@ -20,6 +20,8 @@ jobs:
       - run: docker build -f docker/Dockerfile --build-arg SOLANA_VERSION=${{ env.SOLANA_VERSION }} --tag ${{ env.DOCKER_IMAGE }} .
       # publish to docker.io
       - run: echo "${{ secrets.DOCKER_IO_PASS }}" | docker login docker.io -u ${{ secrets.DOCKER_IO_USER }} --password-stdin
+        if: startsWith( github.ref, 'refs/tags/' )
       - run: docker image tag ${DOCKER_IMAGE} docker.io/pythfoundation/pyth-client:${DOCKER_TAG}
+        if: startsWith( github.ref, 'refs/tags/' )
       - run: docker image push docker.io/pythfoundation/pyth-client:${DOCKER_TAG}
         if: startsWith( github.ref, 'refs/tags/' )