feat(flags): add official PostHog OpenFeature provider

.github/workflows/call-flags-project-board.yml

@@ -14,4 +14,6 @@ jobs:
             pr_number: ${{ github.event.pull_request.number }}
             pr_node_id: ${{ github.event.pull_request.node_id }}
             is_draft: ${{ github.event.pull_request.draft }}
-        secrets: inherit
+        secrets:
+            PROJECT_BOARD_BOT_APP_ID: ${{ secrets.PROJECT_BOARD_BOT_APP_ID }}
+            PROJECT_BOARD_BOT_PRIVATE_KEY: ${{ secrets.PROJECT_BOARD_BOT_PRIVATE_KEY }}

.github/workflows/ci.yml

@@ -256,6 +256,63 @@ jobs:
             - name: Check import produces no warnings
               run: python -W error -c "import posthog"
 
+    openfeature-provider:
+        name: OpenFeature provider Python ${{ matrix.python-version }}
+        runs-on: ubuntu-latest
+        strategy:
+            matrix:
+                python-version: ['3.10', '3.11', '3.12', '3.13', '3.14']
+
+        steps:
+            - uses: actions/checkout@85e6279cec87321a52edac9c87bce653a07cf6c2
+              with:
+                  fetch-depth: 1
+
+            - name: Set up Python ${{ matrix.python-version }}
+              uses: actions/setup-python@8d9ed9ac5c53483de85588cdf95a591a75ab9f55
+              with:
+                  python-version: ${{ matrix.python-version }}
+
+            - name: Install uv
+              uses: astral-sh/setup-uv@cec208311dfd045dd5311c1add060b2062131d57 # v8.0.0
+              with:
+                  enable-cache: true
+
+            # openfeature-provider-posthog is a uv workspace member (declared in
+            # the root pyproject), so commands are scoped to it with --package and
+            # builds are pinned to its own dist/ with --out-dir.
+            - name: Install provider dependencies
+              shell: bash
+              working-directory: openfeature-provider
+              run: |
+                  UV_PROJECT_ENVIRONMENT=$pythonLocation uv sync --package openfeature-provider-posthog --extra dev
+
+            - name: Run provider tests
+              working-directory: openfeature-provider
+              run: |
+                  uv run --package openfeature-provider-posthog pytest --verbose
+
+            - name: Lint and type-check provider
+              working-directory: openfeature-provider
+              run: |
+                  uv run --package openfeature-provider-posthog ruff format --check .
+                  uv run --package openfeature-provider-posthog ruff check .
+                  uv run --package openfeature-provider-posthog mypy .
+
+            - name: Build and verify provider distribution
+              working-directory: openfeature-provider
+              run: |
+                  uv build --package openfeature-provider-posthog --out-dir dist
+                  uv run --with twine twine check dist/*
+
+            - name: Smoke test built wheel in a clean environment
+              working-directory: openfeature-provider
+              shell: bash
+              run: |
+                  uv venv /tmp/of-smoke
+                  uv pip install --python /tmp/of-smoke/bin/python dist/*.whl
+                  /tmp/of-smoke/bin/python -c "from openfeature.contrib.provider.posthog import PostHogProvider; print(PostHogProvider)"
+
     django5-integration:
         name: Django 5 integration tests
         runs-on: ubuntu-latest