ci: setup standard github actions (#4)

## This PR

- adds support for merge queues
- adds placeholder testing action
- adds placeholder release action
- adds pr title validator

### Related Issues

Fixes #3

---------

Signed-off-by: Michael Beemer <[email protected]>

Author: beeme1mr

.github/workflows/doc-exceptions.yaml

@@ -0,0 +1,12 @@
+name: DCO
+on:
+  merge_group:
+
+permissions:  # set top-level default permissions as security best practice
+  contents: read # Check https://github.com/ossf/scorecard/blob/7ce8609469289d5f3b1bf5ee3122f42b4e3054fb/docs/checks.md#token-permissions
+
+jobs:
+  DCO:
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo "skipping DCO check for the merge group"

.github/workflows/lint-pr.yaml

@@ -0,0 +1,47 @@
+name: "Lint PR"
+
+on:
+  pull_request_target:
+    types:
+      - opened
+      - edited
+      - synchronize
+
+permissions:
+  contents: read
+
+jobs:
+  main:
+    permissions:
+      pull-requests: read  # for amannn/action-semantic-pull-request to analyze PRs
+      statuses: write  # for amannn/action-semantic-pull-request to mark status of analyzed PR
+    name: Validate PR title
+    runs-on: ubuntu-latest
+    steps:
+      - uses: amannn/action-semantic-pull-request@v5
+        id: lint_pr_title
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - uses: marocchino/sticky-pull-request-comment@v2
+        # When the previous steps fails, the workflow would stop. By adding this
+        # condition you can continue the execution with the populated error message.
+        if: always() && (steps.lint_pr_title.outputs.error_message != null)
+        with:
+          header: pr-title-lint-error
+          message: |
+            Hey there and thank you for opening this pull request! 👋🏼
+
+            We require pull request titles to follow the [Conventional Commits specification](https://www.conventionalcommits.org/en/v1.0.0/) and it looks like your proposed title needs to be adjusted.
+
+            Details:
+
+            ```
+            ${{ steps.lint_pr_title.outputs.error_message }}
+            ```
+
+      # Delete a previous comment when the issue has been resolved
+      - if: ${{ steps.lint_pr_title.outputs.error_message == null }}
+        uses: marocchino/sticky-pull-request-comment@v2
+        with:
+          header: pr-title-lint-error
+          delete: true

.github/workflows/pr-test.yaml

@@ -0,0 +1,31 @@
+name: PR Test
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  merge_group:
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: test
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        sdk: [3.1, stable, beta]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dart-lang/setup-dart@v1
+        with:
+          sdk: ${{ matrix.sdk }}
+      
+      # TODO: Uncomment once there's something to test!
+      # - name: Install dependencies
+      #  run: dart pub get
+
+      # - name: Run tests
+      #   run: dart test

.github/workflows/release.yaml

@@ -0,0 +1,49 @@
+name: Run Release
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write # for googleapis/release-please-action to create release commit
+      pull-requests: write # for googleapis/release-please-action to create release PR
+    # Release-please creates a PR that tracks all changes
+    steps:
+      - uses: google-github-actions/release-please-action@v3
+        id: release
+        with:
+          command: manifest
+          token: ${{secrets.RELEASE_PLEASE_ACTION_TOKEN}}
+          default-branch: main
+          signoff: "OpenFeature Bot <[email protected]>"
+      - name: Dump Release Please Output
+        env:
+          RELEASE_PLEASE_OUTPUT: ${{ toJSON(steps.release.outputs) }}
+        run: |
+          echo "$RELEASE_PLEASE_OUTPUT"
+    outputs:
+      release_created: ${{ steps.release.outputs.release_created }}
+      release_tag_name: ${{ steps.release.outputs.tag_name }}
+      upload_url: ${{ steps.release.outputs.upload_url }}
+
+  go-release:
+    needs: release-please
+    if: ${{ fromJSON(needs.release-please.outputs.release_created || false) }}
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          ref: ${{ needs.release-please.outputs.release_tag_name }}
+
+      # TODO Configure release process once there's something to release