Use docker buildx to cache docker image in CI

Author: charlespierce

.github/workflows/release.yml

@@ -15,9 +15,16 @@ jobs:
     steps:
       - name: Check out code
         uses: actions/checkout@v3
-      - name: Set up docker image
-        run: docker build -t volta .
-        working-directory: ./ci/docker
+      - name: Set up docker buildx
+        uses: docker/setup-buildx-action@v2
+      - name: Build docker image
+        uses: docker/build-push-action@v3
+        with:
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          context: ./ci/docker
+          push: true
+          tags: volta
       - name: Compile and package Volta
         run: docker run --volume ${PWD}:/root/workspace --workdir /root/workspace --rm --init --tty volta /root/workspace/ci/build-linux.sh volta-linux
       - name: Upload release artifact