docs: add pull request templates

.github/PULL_REQUEST_TEMPLATE/new_extension.md

@@ -0,0 +1,87 @@
+<!--
+Thanks for contributing a new extension to the PostgreSQL Extensions Containers
+project!
+
+Before opening this PR, please make sure you have read:
+  - CONTRIBUTING_NEW_EXTENSION.md (lifecycle for adding an extension)
+  - BUILD.md (build system)
+  - the general CloudNativePG CONTRIBUTING.md:
+    https://github.com/cloudnative-pg/governance/blob/main/CONTRIBUTING.md
+-->
+
+## Extension
+
+<!-- Name of the extension and a short description of what it does and its
+     primary use case. -->
+
+
+
+Closes #<!-- proposal issue id -->
+
+---
+
+## Contributor checklist
+
+<!-- All items must be addressed before requesting a review. -->
+
+- [ ] My commits are signed off for [DCO](https://developercertificate.org/)
+      compliance (`git commit -s`).
+- [ ] Experimental commits have been squashed into a single, well-formed commit.
+- [ ] This PR targets the `main` branch of the upstream repository.
+- [ ] A [New Extension Proposal](https://github.com/cloudnative-pg/postgres-extensions-containers/issues/new/choose)
+      issue exists and is referenced via `Closes #<id>` above.
+- [ ] The commit message follows the format:
+      ``feat: add `<extension-name>` container image``.
+- [ ] The Debian package was verified to exist in the `main` component on both
+      Debian `stable` (`trixie`) and `oldstable` (`bookworm`) via `apt search`.
+- [ ] The extension was scaffolded with `task create-extension NAME=<ext>` and all
+      `TODO` comments in the generated files were resolved.
+- [ ] `metadata.hcl` sets the correct `package` (full Debian version) and, when
+      `create_extension = true`, the matching `sql` (catalog) version.
+- [ ] `create_extension` is set correctly (`false` for PostgreSQL *modules* with
+      no `.control` file, verified with `dpkg -L`).
+- [ ] The `renovate:` annotations in `metadata.hcl` and `README.md` are present
+      and intact (`suite=`, `depName=`, `extractVersion=`).
+- [ ] Every component in the image is covered by a license on the
+      [CNCF Allowlist](https://github.com/cncf/foundation/blob/main/policies-guidance/allowed-third-party-license-policy.md);
+      SPDX `licenses` in `metadata.hcl` are accurate.
+- [ ] `task checks:all` passes locally.
+- [ ] Full E2E passes: `task e2e:test:full TARGET="<extension-name>"`.
+- [ ] `README.md` is complete and includes a working `Cluster` example (plus a
+      `Database` example with `CREATE EXTENSION` when `create_extension = true`).
+- [ ] An entry for the new extension folder was added to
+      [`CODEOWNERS`](https://github.com/cloudnative-pg/postgres-extensions-containers/blob/main/CODEOWNERS)
+      with the component owner's GitHub handle(s).
+- [ ] I confirm my commitment to maintain this extension on behalf of the
+      CloudNativePG community.
+
+---
+
+## Maintainer review checklist
+
+<!-- For maintainers only. Do not merge until every item is verified. -->
+
+- [ ] The linked proposal issue is approved (label `new-extension`) and the
+      `Closes #<id>` reference is correct.
+- [ ] CI is green: the `bake` workflow built the new target for the full
+      `pgVersions × distributions × {amd64, arm64}` matrix.
+- [ ] DCO check passes and history is a single clean commit with the required
+      `feat: add ...` message format.
+- [ ] License compliance reviewed: all redistributed components (extension +
+      transitive/system libs) are on the CNCF Allowlist; SPDX `licenses` match.
+- [ ] `metadata.hcl` reviewed: `package`/`sql` versions, `create_extension`,
+      runtime settings (`shared_preload_libraries`, `*_path`, `env`,
+      `required_extensions`) and behavior flags are correct.
+- [ ] `renovate:` annotations are intact so automated version PRs will track
+      the package going forward.
+- [ ] `Dockerfile` reviewed: final stage is `FROM scratch` and contains only the
+      expected artifacts; the `USER 65532:65532` directive matches the nonroot
+      convention.
+- [ ] E2E / Chainsaw tests pass: the extension is registered (when
+      `create_extension = true`), or the Cluster reaches Healthy with the image
+      mounted for preload-only modules.
+- [ ] `README.md` is clear and its `Cluster` example (and `Database` example
+      when `create_extension = true`) are valid.
+- [ ] `CODEOWNERS` entry is present and the component owner(s) accept the
+      long-term maintenance commitment.
+- [ ] PR targets `main` and is ready to merge.

.github/pull_request_template.md

@@ -0,0 +1,59 @@
+<!--
+Thanks for contributing to the PostgreSQL Extensions Containers project!
+
+This template is for changes other than adding a new extension (version bumps,
+fixes, shared build/tooling changes, documentation, ...). If you are adding a
+new extension, use the "new_extension" template instead by appending
+`?template=new_extension.md` to the PR creation URL.
+
+Before opening this PR, please read BUILD.md and the general CloudNativePG
+CONTRIBUTING.md:
+https://github.com/cloudnative-pg/governance/blob/main/CONTRIBUTING.md
+-->
+
+## Description
+
+<!-- Explain what this PR does and why. -->
+
+
+
+## Type of change
+
+<!-- Tick the box that applies (put an "x" between the brackets, no spaces). -->
+
+- [ ] Update to an existing extension (version bump, fix)
+- [ ] Shared build infrastructure / tooling change
+- [ ] Documentation only
+- [ ] Other (please describe above)
+
+<!-- If this fixes an open issue, reference it here, for example: Closes #123 -->
+
+
+---
+
+## Contributor checklist
+
+- [ ] My commits are signed off for [DCO](https://developercertificate.org/)
+      compliance (`git commit -s`).
+- [ ] This PR targets the `main` branch of the upstream repository.
+- [ ] `task checks:all` passes locally.
+- [ ] For changes affecting one or more extensions, the relevant build and E2E
+      tests pass (e.g. `task bake TARGET=<ext>`, `task e2e:test:full TARGET=<ext>`).
+- [ ] Any `// renovate:` comments touched in `metadata.hcl` / `README.md` remain
+      intact (`suite=`, `depName=`, `extractVersion=`).
+- [ ] Documentation (`README.md`, `BUILD.md`, ...) updated where relevant.
+
+---
+
+## Maintainer review checklist
+
+<!-- For maintainers only. -->
+
+- [ ] CI is green for all affected targets / shared changes.
+- [ ] DCO check passes.
+- [ ] Change reviewed for correctness and scope; no unintended targets rebuilt.
+- [ ] `// renovate:` annotations preserved so automated version tracking keeps
+      working.
+- [ ] If shared infrastructure changed, the `_shared` filter in
+      `.github/workflows/bake.yml` was updated when all extensions must rebuild.
+- [ ] PR targets `main` and is ready to merge.

CONTRIBUTING_NEW_EXTENSION.md

@@ -302,5 +302,14 @@ Submission Requirements:
   file listing the GitHub handles of the component owner(s) for the new
   extension folder.
 
+> [!IMPORTANT]
+> When opening the Pull Request, use the **new extension** template, which
+> includes the full contributor checklist for this lifecycle. GitHub does not
+> show a chooser for PR templates, so open the PR with this link to preselect
+> it:
+> [Open a new-extension PR](https://github.com/cloudnative-pg/postgres-extensions-containers/compare?expand=1&template=new_extension.md).
+> For any other change (version bumps, fixes, tooling, docs), the default
+> template is applied automatically, so you can open the PR normally.
+
 By submitting, you confirm your commitment to maintain this extension on behalf
 of the CloudNativePG Community.