.github/workflows: prepare container for xbps-cycles

.github/workflows/cron.yml

@@ -15,6 +15,23 @@ jobs:
           process-only: 'prs'
   cycles:
     runs-on: ubuntu-latest
+    container:
+        image: 'ghcr.io/void-linux/xbps-src-masterdir:20210313rc01-x86_64-musl'
     steps:
-      - run: apt-get install -y python3-networkx
+      - name: Prepare container
+        run: |
+          # Sync and upgrade once, assume error comes from xbps update
+          xbps-install -Syu || xbps-install -yu xbps
+          # Upgrade again (in case there was a xbps update)
+          xbps-install -yu
+          # Install script dependencies
+          xbps-install -y python3-networkx
+      - uses: actions/checkout@v1
+        with:
+          fetch-depth: 1
+      - name: Create hostrepo and prepare masterdir
+        run: |
+         ln -s "$(pwd)" /hostrepo &&
+         common/travis/set_mirror.sh &&
+         common/travis/prepare.sh
       - run: common/scripts/xbps-cycles.py