Update alpine Docker tag to v3.21.0

.github/workflows/build-docker-image.yaml

@@ -24,7 +24,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
       - name: Build and push
         id: docker_build
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v4
         with:
           push: true
           platforms: linux/amd64,linux/arm64,linux/arm/v7

Dockerfile

@@ -4,7 +4,7 @@ COPY . .
 RUN go get -d -v .
 RUN go build -v ./cmd/aaisp_exporter
 
-FROM alpine:3.17.2
+FROM alpine:3.21.0
 WORKDIR /service
 COPY --from=build /build/aaisp_exporter .
 ENTRYPOINT ["./aaisp_exporter"]