[TASK] Initial release

.gitattributes

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+/.github/ export-ignore
+/Build/ export-ignore
+/Tests/ export-ignore
+/.editorconfig export-ignore
+/.gitattributes export-ignore
+/.github/ export-ignore
+/.gitignore export-ignore

.github/workflows/core12.yml

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+name: core 12
+
+on: [ push, pull_request ]
+
+jobs:
+  tests:
+    name: v12
+    runs-on: ubuntu-20.04
+    strategy:
+      # This prevents cancellation of matrix job runs, if one/two already failed and let the
+      # rest matrix jobs be executed anyway.
+      fail-fast: false
+      matrix:
+        php: [ '8.1', '8.2' ]
+        composerInstall: [ 'composerInstallLowest', 'composerInstallHighest' ]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Install testing system
+        run: Build/Scripts/runTests.sh -t 12 -p ${{ matrix.php }}  -s ${{ matrix.composerInstall }}
+
+      - name: Lint PHP
+        run: Build/Scripts/runTests.sh -t 12 -p ${{ matrix.php }} -s lint
+
+      - name: Validate code against CGL
+        run: PHP_CS_FIXER_IGNORE_ENV=1 Build/Scripts/runTests.sh -t 12 -p 8.2 -s cgl -n
+
+      - name: Unit Tests
+        run: Build/Scripts/runTests.sh -t 12 -p ${{ matrix.php }} -s unit

.gitignore

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+/.Build
+/composer.lock
+/var
+.php-cs-fixer.cache
+/Build/testing-docker/.env
+/Documentation-GENERATED-temp/
+/.DS_Store