chore: colocate custom runner dockerfiles next to manifests

.github/workflows/build-actions-runner-images.yaml

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+name: Build Actions Runner Images
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - apps/actions-runner-controller/runners/**
+  schedule:
+    - cron: "0 0 * * 0"
+
+env:
+  REGISTRY: ghcr.io
+
+jobs:
+  build-matrix:
+    name: Build Matrix
+    runs-on: self-hosted
+    outputs:
+      contexts: ${{ steps.find-dockerfiles.outputs.contexts }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Find all Dockerfiles to build
+        id: find-dockerfiles
+        run: |
+          CONTEXTS=$(find apps/actions-runner-controller/runners \
+            -name Dockerfile -printf '%h\n' | \
+            jq -R -s -c 'split("\n")[:-1]')
+
+          echo "contexts=${CONTEXTS}" >> "${GITHUB_OUTPUT}"
+
+  build-image:
+    name: Build Image
+    runs-on: self-hosted
+    needs:
+      - build-matrix
+    permissions:
+      contents: read
+      packages: write
+    strategy:
+      matrix:
+        context: ${{ fromJSON(needs.build-matrix.outputs.contexts) }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Build image name
+        id: image-name
+        env:
+          context: ${{ matrix.context }}
+        run: |
+          echo "name=${context#apps/actions-runner-controller/runners/}" >> "${GITHUB_OUTPUT}"
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Docker login
+        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin
+
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        with:
+          context: ${{ matrix.context }}
+          push: true
+          tags: ${{ env.REGISTRY }}/invakid404/runners/${{ steps.image-name.outputs.name }}:latest
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

apps/actions-runner-controller/runners/abcccid/Dockerfile

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+FROM summerwind/actions-runner:latest
+
+COPY install-deps.sh .
+RUN ./install-deps.sh

apps/actions-runner-controller/runners/abcccid/install-deps.sh

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+sudo add-apt-repository ppa:mozillateam/ppa
+echo '
+Package: *
+Pin: release o=LP-PPA-mozillateam
+Pin-Priority: 1001
+' | sudo tee /etc/apt/preferences.d/mozilla-firefox
+
+sudo apt update
+sudo apt install -y jq firefox
+
+json=$(curl -s https://api.github.com/repos/mozilla/geckodriver/releases/latest)
+url=$(printf "%s" "$json" | jq -r '.assets[].browser_download_url | select(contains("linux64") and endswith("gz"))')
+curl -s -L "$url" | sudo tar -xz
+sudo chmod +x geckodriver
+sudo mv geckodriver /usr/bin/
+
+ls -la /usr/bin/geckodriver