PRDoc new schema (#1946)

## Overview

This PR brings in the new version of prdoc v0.0.6 and allows:
- local schema
- local config
- local template

It also fixes the existing prdoc files to match the new schema.

## todo

- [x] add a brief doc/tldr to help contributors get started
- [x] test CI
- [x] finalize schema
- [x] publish the next `prdoc` cli version (v0.0.7 or above)

---------

Co-authored-by: Egor_P <egor@parity.io>
Co-authored-by: Bastian Köcher <git@kchr.de>

.github/workflows/check-prdoc.yml

@@ -6,26 +6,27 @@ on:
   merge_group:
 
 env:
-  IMAGE: paritytech/prdoc:v0.0.5
+  IMAGE: docker.io/paritytech/prdoc:v0.0.7
   API_BASE: https://api.github.com/repos
   REPO: ${{ github.repository }}
   GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
   GITHUB_PR: ${{ github.event.pull_request.number }}
-  MOUNT: /prdoc
   ENGINE: docker
+  PRDOC_DOC: https://github.com/paritytech/polkadot-sdk/blob/master/docs/prdoc.md
 
 jobs:
   check-prdoc:
     runs-on: ubuntu-latest
     steps:
+      # we cannot show the version in this step (ie before checking out the repo)
+      # due to https://github.com/paritytech/prdoc/issues/15
       - name: Skip merge queue
         if: ${{ contains(github.ref, 'gh-readonly-queue') }}
         run: exit 0
       - name: Pull image
         run: |
           echo "Pulling $IMAGE"
-          docker pull $IMAGE
-          docker run --rm $IMAGE --version
+          $ENGINE pull $IMAGE
 
       - name: Check if PRdoc is required
         id: get-labels
@@ -36,18 +37,29 @@ jobs:
           echo "Labels: ${labels}"
           echo "labels=${labels}" >> "$GITHUB_OUTPUT"
 
-      - name: No PRdoc required
+      - name: Checkout repo
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 #v4.1.1
+
+      - name: Check PRDoc version
+        run: |
+          $ENGINE run --rm -v $PWD:/repo $IMAGE --version
+
+      - name: Early exit if PR is silent
         if: ${{ contains(steps.get-labels.outputs.labels, 'R0') }}
         run: |
-          echo "PR detected as silent, no PRdoc is required, exiting..."
+          hits=$(find prdoc -name "pr_$GITHUB_PR*.prdoc" | wc -l)
+          if (( hits > 0 )); then
+            echo "PR detected as silent, but a PRDoc was found, checking it as information"
+            $ENGINE run --rm -v $PWD:/repo $IMAGE check -n ${GITHUB_PR} || echo "Ignoring failure"
+          else
+            echo "PR detected as silent, no PRDoc found, exiting..."
+          fi
+          echo "If you want to add a PRDoc, please refer to $PRDOC_DOC"
           exit 0
 
-      - name: Checkout repo
-        if: ${{ !contains(steps.get-labels.outputs.labels, 'R0') }}
-        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 #v4.1.1
-
       - name: PRdoc check for PR#${{ github.event.pull_request.number }}
         if: ${{ !contains(steps.get-labels.outputs.labels, 'R0') }}
         run: |
-          echo "Checking for PR#${GITHUB_PR} in $MOUNT"
-          $ENGINE run --rm -v $PWD/prdoc:/doc $IMAGE check -n ${GITHUB_PR} || true
+          echo "Checking for PR#${GITHUB_PR}"
+          echo "You can find more information about PRDoc at $PRDOC_DOC"
+          $ENGINE run --rm -v $PWD:/repo $IMAGE check -n ${GITHUB_PR}