new workflow to automate github release creation

.github/workflows/release.yml

@@ -0,0 +1,50 @@
+name: Release
+
+on:
+    push:
+        tags:
+            - 'v*'
+
+jobs:
+    release:
+        name: Release app version
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v2
+            - uses: actions/setup-node@v1
+              with:
+                  node-version: 12.x
+            - uses: actions/cache@v1
+              with:
+                  path: node_modules
+                  key: nodeModules-${{ hashFiles('**/yarn.lock') }}
+                  restore-keys: |
+                      nodeModules-
+            - name: Install dependencies
+              run: yarn install --frozen-lockfile
+              env:
+                  CI: true
+            - name: Build app package
+              run: |
+                  yarn package
+                  mv dist/*.spl dist/slack-alerts.spl
+            - name: Create Release
+              id: create_release
+              uses: actions/create-release@v1
+              env:
+                  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+              with:
+                  tag_name: ${{ github.ref }}
+                  release_name: Release ${{ github.ref }}
+                  draft: false
+                  prerelease: false
+            - name: Upload Release Asset
+              id: upload-release-asset
+              uses: actions/upload-release-asset@v1
+              env:
+                  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+              with:
+                  upload_url: ${{ steps.create_release.outputs.upload_url }} # This pulls from the CREATE RELEASE step above, referencing it's ID to get its outputs object, which include a `upload_url`. See this blog post for more info: https://jasonet.co/posts/new-features-of-github-actions/#passing-data-to-future-steps
+                  asset_path: ./dist/slack-alerts.spl
+                  asset_name: slack-alerts-${{ github.ref }}.tgz
+                  asset_content_type: application/gzip