Update alpine Docker tag to v3.21.0

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

@@ -14,7 +14,7 @@ jobs:
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v2
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v2
       - name: Login to GHCR
         uses: docker/login-action@v2
         if: github.event_name != 'pull_request'

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"]