create workflow for automatically updating the translation sources (#4543)

* create workflow for automatically updating the translation sources

* change to once per month

.github/workflows/translations.yml

@@ -0,0 +1,66 @@
+name: Update translation source
+
+on:
+  workflow_dispatch:
+  schedule:
+    # runs once per month
+    - cron: '0 0 1 * *'
+
+jobs:
+  translations:
+    # Do not run the scheduled workflow on forks
+    if: github.event != 'schedule' || github.repository_owner == 'Cockatrice'
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Install lupdate
+        shell: bash
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends qttools5-dev-tools
+
+      - name: Checkout repo
+        uses: actions/checkout@v2
+
+      - name: Update cockatrice translations
+        shell: bash
+        run: |
+          shopt -s globstar # globstar is needed for recursive **
+          lupdate -version
+          echo "reading the following source files:"
+          # note: there are three strings to translate in common right now
+          echo {cockatrice,common}/**/*.{cpp,h}
+          echo "$(echo {cockatrice,common}/**/*.{cpp,h} | wc -w) files total"
+          lupdate {cockatrice,common}/**/*.{cpp,h} -ts cockatrice/translations/cockatrice_en@source.ts
+
+      - name: Update oracle translations
+        shell: bash
+        run: |
+          shopt -s globstar # globstar is needed for recursive **
+          lupdate -version
+          echo "reading the following source files:"
+          echo oracle/**/*.{cpp,h}
+          echo "$(echo oracle/**/*.{cpp,h} | wc -w) files total"
+          lupdate oracle/**/*.{cpp,h} -ts oracle/translations/oracle_en@source.ts
+
+      - name: Check for updates
+        id: check
+        shell: bash
+        run: |
+          set +e # do not fail, just save the exit state
+          git diff --exit-code
+          echo "::set-output name=deploy::$?"
+
+      - name: Commit changes
+        if: steps.check.outputs.deploy == '1'
+        shell: bash
+        working-directory: ${{env.OUTPUT_PATH}}
+        run: |
+          git config user.name github-actions
+          git config user.email github-actions@github.com
+          git add cockatrice/translations/cockatrice_en@source.ts oracle/translations/oracle_en@source.ts
+          git commit -m "Automated translation update ( $GITHUB_SHA )"
+          git push
+          deploy_commit=$(git rev-parse HEAD)
+          echo "Created commit: $GITHUB_SERVER_URL/$GITHUB_REPOSITORY/commit/$deploy_commit"