add ci

Author: tcmal

.dockerignore

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+*
+.*

.github/workflows/main.yml

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+name: Build
+on:
+  push:
+  workflow_dispatch:
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+jobs:
+  docker-rebuild:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - uses: dorny/paths-filter@v3
+        id: filter
+        with:
+          filters: |
+            docker-rebuild:
+              - 'Dockerfile'
+
+      - name: Log in to the Container registry
+        if: steps.filter.outputs.docker-rebuild == 'true'
+        uses: docker/login-action@v3.4.0
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        if: steps.filter.outputs.docker-rebuild == 'true'
+        id: meta
+        uses: docker/metadata-action@v5.7.0
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push
+        if: steps.filter.outputs.docker-rebuild == 'true'
+        uses: docker/build-push-action@v6
+        with:
+          context: "."
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+
+  build:
+    runs-on: ubuntu-latest
+    needs: docker-rebuild
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Check if this branch has its own docker image
+        id: check_image
+        run: |-
+          IMAGE_NAME="${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.ref_name }}"
+          if docker pull $IMAGE_NAME; then
+            echo "Image exists"
+            echo "ref=${{ github.ref_name }}" >> $GITHUB_OUTPUT
+          else
+            echo "Image does not exist"
+            echo "ref=main" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Build
+        run: |
+          docker run --rm -v $(pwd):/src -w /src ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.check_image.outputs.ref }} just build
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: build/
+
+  deploy:
+    needs: build
+    if: github.ref_name == github.event.repository.default_branch
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    concurrency:
+      group: "pages"
+      cancel-in-progress: false
+    permissions:
+      contents: read
+      pages: write
+      id-token: write
+    runs-on: ubuntu-latest
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

Dockerfile

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+FROM ubuntu:24.04
+
+RUN <<EOF
+    set -e
+    apt-get update
+    apt-get -y install just curl ca-certificates
+EOF
+
+ENV SOUPAULT_VERSION=5.3.0
+RUN <<EOF
+    set -e
+    curl -vL https://files.baturin.org/software/soupault/$SOUPAULT_VERSION/soupault-$SOUPAULT_VERSION-linux-x86_64.tar.gz | tar xzv
+    mv -v ./soupault-$SOUPAULT_VERSION-linux-x86_64/soupault /usr/bin/
+EOF