github: Add action to deploy nightly snapshots (#618)

Signed-off-by: Harsh Shandilya <msfjarvis@gmail.com>

.github/workflows/deploy_nightly_snapshots.yml

@@ -0,0 +1,41 @@
+name: "Release nightly snapshots"
+on:
+  schedule:
+  - cron: '0 0 * * *'
+
+jobs:
+  deploy-release-snapshot:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v1
+
+    - name: Decrypt secrets
+      run: release/signing-setup.sh "$ENCRYPT_KEY"
+      env:
+        ENCRYPT_KEY: ${{ secrets.ENCRYPT_KEY }}
+
+    - uses: actions/cache@v1
+      with:
+          path: ~/.gradle/caches
+          key: gradle-${{ runner.os }}-${{ hashFiles('**/build.gradle') }}-${{ hashFiles('**/gradle/wrapper/gradle-wrapper.properties') }}-${{ hashFiles('**/dependencies.gradle') }}
+
+    - name: Download gradle dependencies
+      run: ./gradlew dependencies
+
+    - name: Build release app
+      run: ./gradlew :app:assembleRelease
+      env:
+        SNAPSHOT: "true"
+
+    - name: Clean secrets
+      run: release/signing-cleanup.sh
+
+    - name: Deploy snapshot
+      run: release/deploy-snapshot.sh
+      env:
+        ACTIONS_DEPLOY_KEY: ${{ secrets.ACTIONS_DEPLOY_KEY }}
+        SSH_USERNAME: ${{ secrets.SSH_USERNAME }}
+        SERVER_ADDRESS: ${{ secrets.SERVER_ADDRESS }}
+        SERVER_DESTINATION: ${{ secrets.SERVER_DESTINATION }}
+        SSH_PORT: ${{ secrets.SSH_PORT }}