Split closure build process off to stand alone repo

Author: JarrodCTaylor

.github/workflows/closure.yml

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+name: Build Google closure library
+
+on:
+  workflow_dispatch:
+    inputs:
+      deploy:
+        description: "Deploy to Maven Central"
+        required: true
+        default: false
+        type: boolean
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check out
+      uses: actions/checkout@v3
+    - name: Set Github identity
+      run: |
+        git config --global user.name clojure-build
+        git config --global user.email "[email protected]"
+    - name: Set up Java
+      uses: actions/setup-java@v3
+      with:
+        java-version: 8
+        distribution: 'temurin'
+        server-id: sonatype-nexus-staging
+        server-username: MAVEN_USERNAME
+        server-password: MAVEN_PASSWORD
+        gpg-private-key: ${{ secrets.OSSRH_GPG_SECRET_KEY }}
+        gpg-passphrase: GPG_PASSPHRASE
+    - name: Release
+      run: |
+        cd script/closure-library-release
+        ./closure-library-release.sh
+      env:
+        MAVEN_USERNAME: ${{ secrets.OSSRH_USERNAME }}
+        MAVEN_PASSWORD: ${{ secrets.OSSRH_PASSWORD }}
+        GPG_PASSPHRASE: ${{ secrets.OSSRH_GPG_SECRET_KEY_PASSWORD }}
+        HUDSON: ${{ github.event.inputs.deploy }}

README.md

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+# build.closure
+
+ClojureScript depends on the Google Closure JavaScript Libraries,
+but Google does not publish those libraries in a Maven repository.
+The github action in this repo generates Maven projects for the
+Google Closure Library and, optionally, deploys them.
+
+The Google Closure Libraries are divided into two parts: the main
+library and third-party extensions. The main library is Apache
+licensed; the third-party extensions have a variety of different
+licenses. However, code in the main library depends on the
+third-party extensions, not the other way around. See CLJS-418 for
+details.
+
+To manage this, we build two JARs, google-closure-library and
+google-closure-library-third-party, with the former declaring an
+explicit dependency on the latter. This permits consumers to exclude
+the third-party libraries (and their various licenses) if they know
+they don't need them.
+
+To match this structure, we need to alter the deps.js file that the
+Google Closure Compiler uses to resolve dependencies. See CLJS-276
+for details.
+
+The last release ZIP made by Google was 20130212-95c19e7f0f5f. To
+get newer versions, we have to go to the Git repository.
+
+