chore: add workflows for health and publishing

Author: kevmoo

.github/workflows/health.yaml

@@ -0,0 +1,12 @@
+name: Health
+
+on:
+  pull_request:
+    branches: [ main ]
+    types: [opened, synchronize, reopened, labeled, unlabeled]
+
+jobs:
+  health:
+    uses: dart-lang/ecosystem/.github/workflows/health.yaml@main
+    permissions:
+      pull-requests: write

.github/workflows/post_summaries.yaml

@@ -0,0 +1,15 @@
+name: Comment on the pull request
+
+on:
+  workflow_run:
+    workflows:
+      - Health
+      - Publish
+    types:
+      - completed
+
+jobs:
+  upload:
+    uses: dart-lang/ecosystem/.github/workflows/post_summaries.yaml@main
+    permissions:
+      pull-requests: write

.github/workflows/publish.yaml

@@ -0,0 +1,16 @@
+# A CI configuration to auto-publish pub packages.
+name: Publish
+
+on:
+  pull_request:
+    branches: [ main ]
+    types: [opened, synchronize, reopened, labeled, unlabeled]
+  push:
+    tags: [ '[0-9A-z]+-v[0-9]+.[0-9]+.[0-9]+' ]
+
+jobs:
+  publish:
+    uses: dart-lang/ecosystem/.github/workflows/publish.yaml@main
+    permissions:
+      id-token: write
+      pull-requests: write