Adds github actions for building ZIP

.distignore

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+/.git
+/.github
+.distignore
+.gitignore

.gitattributes

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+/.wordpress-org export-ignore
+/.github export-ignore
+
+/.gitattributes export-ignore
+/.gitignore export-ignore

.github/workflows/main.yml

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+name: Build release zip
+
+on:
+  workflow_dispatch
+
+jobs:
+  build:
+    name: Build release zip
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+    - name: Generate zip
+      uses: 10up/action-wordpress-plugin-build-zip@stable
+      with:
+        retention-days: 1 # Optional; defaults to 5