Create a nightly build

Builds a version of the plugin from master.

.github/workflows/nightly.yml

@@ -0,0 +1,36 @@
+name: Publish nightly build artifacts
+
+on:
+  push:
+    branches:
+      - master
+  schedule:
+    - cron: '0 0 * * *'
+
+jobs:
+  build_and_publish:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ghidra: ["9.2", "9.2.1", "9.2.2"]
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions/setup-java@v1
+        with:
+          java-version: "11"
+          java-package: jdk
+          architecture: x64
+      - uses: er28-0652/setup-ghidra@master
+        with:
+          version: ${{ matrix.ghidra }}
+      - uses: eskatos/gradle-command-action@v1
+        with:
+          gradle-version: current
+          arguments: buildExtension -PGHIDRA_INSTALL_DIR=${{ env.GHIDRA_INSTALL_DIR }}
+      - uses: svenstaro/upload-release-action@v1-release
+        with:
+          repo_token: ${{ secrets.GITHUB_TOKEN }}
+          file: dist/*ghidra-emotionengine.zip
+          tag: "latest"
+          overwrite: true
+          file_glob: true