CI: Ensure Docker tags derived from refs include legal characters

.github/workflows/release.yaml

@@ -35,7 +35,7 @@ jobs:
           git config user.email "$GITHUB_ACTOR@users.noreply.github.com"
 
       - name: Get the current tag name
-        run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
+        run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" | sed 's/\//_/g' >> $GITHUB_ENV
 
       - name: Setup QEMU
         uses: docker/setup-qemu-action@v1

cmd/seaweedfs-csi-driver/Dockerfile

@@ -1,6 +1,9 @@
-FROM frolvlad/alpine-glibc as builder
+FROM amd64/golang:1.16-alpine as builder
+
 RUN apk add git go g++ curl jq
 
+WORKDIR /
+
 RUN curl -sL \
     $(curl -s https://api.github.com/repos/chrislusf/seaweedfs/releases/latest \
     | jq -r '.assets[]|select(.name=="linux_amd64.tar.gz")|.browser_download_url') \