try multi-arch build, update CI workflows

.github/workflows/publish-docker-images.yml

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+name: publish-docker-images
+on:
+  workflow_dispatch:
+  push:
+    tags:
+      - "v*"
+
+jobs:
+  build:
+    name: docker-publish
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Src Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          fetch-tags: true
+
+      - name: write tags env vars
+        run: |
+          TAG=$(git describe --tags)
+          LATEST_TAG=$(git tag -l | grep -viE '(alpha|beta)' | sort -V | tail -n 1)
+          GITHASH="$(git rev-parse HEAD)"
+          echo "TAG=$TAG"
+          echo "TAG=${TAG}" >> "$GITHUB_ENV"
+          echo "LATEST_TAG=${LATEST_TAG}"
+          echo "LATEST_TAG=${LATEST_TAG}" >> "$GITHUB_ENV"
+          echo "GITHASH=${GITHASH}"
+          echo "GITHASH=${GITHASH}" >> "$GITHUB_ENV"
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            cactus4docker/go-camo
+            ghcr.io/cactus/go-camo
+          tags: |
+            # set latest tag for master branch
+            type=raw,value=${{ env.TAG }}
+            type=raw,value=latest,enable=${{ env.TAG == env.LATEST_TAG }}
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          password: ${{ secrets.DOCKER_PASSWORD }}
+          username: ${{ secrets.DOCKER_USERNAME }}
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          file: ./examples/Dockerfile-build
+          platforms: linux/amd64,linux/arm64
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache
+          build-args: |
+            GITHASH=${{env.GITHASH}}
+            APP_VER=${{env.TAG}}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

examples/Dockerfile-build

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+FROM golang:alpine as builder
+RUN apk add --no-cache ca-certificates tzdata make git
+WORKDIR /workdir
+ENV GOEXPERIMENT=loopvar
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . ./
+ARG APP_VER
+RUN make build APP_VER="${APP_VER}" GITHASH="${GITHASH}"; rm -rf /root/.cache/
+
+FROM alpine:latest as run
+RUN apk add --no-cache ca-certificates tzdata
+WORKDIR /app
+COPY --from=builder --link /workdir/build/bin/* /bin/
+
+USER nobody
+EXPOSE 8080/tcp
+ENTRYPOINT ["/bin/go-camo"]