Create porter_stack_demo.yml file (#12)

Co-authored-by: porter-sandbox-deployment-app[bot] <158510531+porter-sandbox-deployment-app[bot]@users.noreply.github.com>

Author: porter-sandbox-deployment-app[bot]

.github/workflows/porter_stack_demo.yml

@@ -0,0 +1,29 @@
+"on":
+  push:
+    branches:
+    - demo
+name: Deploy to demo
+jobs:
+  porter-deploy:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v3
+    - name: Set Github tag
+      id: vars
+      run: echo "sha_short=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT
+    - name: Setup porter
+      uses: porter-dev/[email protected]
+    - name: Deploy stack
+      timeout-minutes: 30
+      run: exec porter apply
+      env:
+        PORTER_CLUSTER: "1191"
+        PORTER_DEPLOYMENT_TARGET_ID: cd217dd5-4f80-4a6b-a702-de2abc964920
+        PORTER_HOST: https://cloud.porter.run
+        PORTER_PR_NUMBER: ${{ github.event.number }}
+        PORTER_PROJECT: "1278"
+        PORTER_REPO_NAME: ${{ github.event.repository.name }}
+        PORTER_STACK_NAME: demo
+        PORTER_TAG: ${{ steps.vars.outputs.sha_short }}
+        PORTER_TOKEN: ${{ secrets.PORTER_STACK_1278_1191 }}