introduce GitHub actions for automated plugin/asset deployment

.github/workflows/wordpress-plugin-asset-update.yml

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+name: Plugin asset/readme update
+on:
+  push:
+    branches:
+      - master
+jobs:
+  master:
+    name: Push to master
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: php-actions/composer@v5
+      - name: Clean README.md
+        run: tail -n +7 README.md > README.md.tmp && mv README.md.tmp README.md
+      - name: WordPress.org plugin asset/readme update
+        uses: 10up/action-wordpress-plugin-asset-update@stable
+        env:
+          ASSETS_DIR: assets
+          README_NAME: README.md
+          SVN_PASSWORD: ${{ secrets.WP_SVN_PASSWORD }}
+          SVN_USERNAME: ${{ secrets.WP_SVN_USERNAME }}

.github/workflows/wordpress-plugin-deploy.yml

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+name: Deploy to WordPress.org
+on:
+  push:
+    tags:
+      - "v*"
+      - "!v*-*"
+jobs:
+  tag:
+    name: New tag
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: php-actions/composer@v5
+      - name: Clean README.md
+        run: tail -n +7 README.md > README.md.tmp && mv README.md.tmp README.md
+      - name: WordPress Plugin Deploy
+        uses: 10up/action-wordpress-plugin-deploy@stable
+        env:
+          ASSETS_DIR: assets
+          SVN_PASSWORD: ${{ secrets.WP_SVN_PASSWORD }}
+          SVN_USERNAME: ${{ secrets.WP_SVN_USERNAME }}