Enable Porter Application preview (#2521)

Hello 👋 from Porter! Please merge this PR to finish setting up your
application.

Co-authored-by: porter-deployment-app[bot] <87230664+porter-deployment-app[bot]@users.noreply.github.com>

.github/workflows/porter_stack_preview.yml

@@ -0,0 +1,28 @@
+"on":
+  push:
+    branches:
+    - main
+name: Deploy to preview
+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/setup-porter@v0.1.0
+    - name: Deploy stack
+      timeout-minutes: 30
+      run: exec porter apply
+      env:
+        PORTER_CLUSTER: "3877"
+        PORTER_DEPLOYMENT_TARGET_ID: cd21d246-86df-49e0-ba0a-78e2802572e7
+        PORTER_HOST: https://dashboard.getporter.dev
+        PORTER_PR_NUMBER: ${{ github.event.number }}
+        PORTER_PROJECT: "10983"
+        PORTER_STACK_NAME: preview
+        PORTER_TAG: ${{ steps.vars.outputs.sha_short }}
+        PORTER_TOKEN: ${{ secrets.PORTER_STACK_10983_3877 }}