add GH actions

Author: Gummibeer

.github/FUNDING.yml

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+# These are supported funding model platforms
+
+github: [Gummibeer]
+patreon: # Replace with a single Patreon username
+open_collective: astrotomic
+ko_fi: # Replace with a single Ko-fi username
+tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
+community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+liberapay: # Replace with a single Liberapay username
+issuehunt: astrotomic
+otechie: # Replace with a single Otechie username
+custom: ['https://offset.earth/treeware']

.github/workflows/composer-normalize.yml

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+name: normalize composer.json
+
+on:
+  push:
+    paths:
+      - 'composer.json'
+
+jobs:
+  normalize:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Git checkout
+        uses: actions/checkout@v2
+
+      - name: normalize composer.json
+        run: |
+          composer global require ergebnis/composer-normalize
+          composer normalize
+
+      - uses: stefanzweifel/[email protected]
+        with:
+          commit_message: normalize composer.json

.github/workflows/run-tests.yml

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+name: run-tests
+
+on:
+  push:
+  schedule:
+    - cron: '0 0 * * *'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: true
+      matrix:
+        php: [7.4]
+        dependency-version: [prefer-lowest, prefer-stable]
+
+    name: P${{ matrix.php }} - ${{ matrix.dependency-version }}
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Cache dependencies
+        uses: actions/cache@v1
+        with:
+          path: ~/.composer/cache/files
+          key: dependencies-php-${{ matrix.php }}-composer-${{ hashFiles('composer.json') }}
+          keys: |
+            dependencies-php-${{ matrix.php }}-composer-
+            dependencies-php-
+
+      - name: Install dependencies
+        run: composer update --${{ matrix.dependency-version }} --prefer-dist --no-interaction --no-suggest
+
+      - name: Execute tests
+        run: vendor/bin/pest