[CI] Add Docker-Publish pipeline

Signed-off-by: Knut Ahlers <knut@ahlers.me>

.github/workflows/docker-publish.yml

@@ -0,0 +1,36 @@
+---
+
+name: docker-publish
+on:
+  push:
+    branches: ['master']
+    tags: ['v*']
+
+permissions:
+  packages: write
+
+jobs:
+  docker-publish:
+    defaults:
+      run:
+        shell: bash
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          lfs: true
+          show-progress: false
+
+      - name: Log into registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Docker Build & Publish
+        run: bash ci/docker-publish.sh
+
+...

Dockerfile

@@ -1,7 +1,7 @@
 FROM luzifer/archlinux as builder
 
-COPY . /go/src/github.com/Luzifer/twitch-bot
+COPY . /go/src/twitch-bot
-WORKDIR /go/src/github.com/Luzifer/twitch-bot
+WORKDIR /go/src/twitch-bot
 
 ENV CGO_ENABLED=0 \
     GOPATH=/go
@@ -10,10 +10,12 @@ RUN set -ex \
  && pacman -Syy --noconfirm \
       curl \
       git \
+      git-lfs \
       go \
       make \
       nodejs-lts-hydrogen \
       npm \
+ && git config --global --add safe.directory /go/src/twitch-bot \
  && make node_modules frontend_prod \
  && go install \
       -trimpath \

ci/docker-publish.sh

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+function log() {
+  echo "[$(date +%H:%M:%S)] $@" >&2
+}
+
+[[ -n $GITHUB_REF_NAME ]] || {
+  log "ERR: This script is intended to run on a Github Action only."
+  exit 1
+}
+
+repo="ghcr.io/${GITHUB_REPOSITORY,,}"
+tags=()
+
+case "${GITHUB_REF_TYPE}" in
+branch)
+  # Generic build to develop: Workflow has to limit branches to master
+  tags+=(develop)
+  ;;
+tag)
+  # Build to latest & stable: Older tags are not intended to rebuild
+  tags+=(latest stable ${GITHUB_REF_NAME})
+  ;;
+*)
+  log "ERR: The ref type ${GITHUB_REF_TYPE} is not handled."
+  exit 1
+  ;;
+esac
+
+log "Building Docker image..."
+docker build -t "${repo}:local" .
+
+for ref in "${tags[@]}"; do
+  log "Pushing Docker image to '${repo}:${ref}'..."
+  docker tag "${repo}:local" "${repo}:${ref}"
+  docker push "${repo}:${ref}"
+done
+
+log "Publish finished."