Add readme and msrv to pr updates

Author: tjtelan

.github/workflows/release-plz.yml

@@ -49,8 +49,33 @@ jobs:
       - *install-rust
       - name: Run release-plz
         uses: release-plz/[email protected]
+        id: release-plz
         with:
           command: release-pr
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}
+          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}
+      - name: Install cargo-msrv and update MSRV in Cargo.toml
+        timeout-minutes: 10
+        run: |
+          cargo install cargo-msrv
+          cargo msrv find --write-msrv
+      - name: Install cargo-rdme and update readme
+        run: |
+          cargo install cargo-rdme
+          cargo rdme
+      - name: Update msrv and/or readme in the release PR
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PR: ${{ steps.release-plz.outputs.pr }}
+        run: |
+          set -e
+
+          pr_number=${{ fromJSON(steps.release-plz.outputs.pr).number }}
+          if [[ -n "$pr_number" ]]; then
+            gh pr checkout $pr_number
+            # change "echo" with your commands
+            git add .
+            git commit -m "ci: Update msrv and/or readme"
+            git push
+          fi