💚(project) fix moodle-plugin-ci installation

Our GitHub workflow fails to install moodle-plugin-ci due to an nvm
update (v0.39.7 -> v0.40.0) in Ubuntu 22.04.
As a workaround, we decided to manually install nvm v0.39.7 in the
"Initialise moodle-plugin-ci" step.

Author: SergioSim

.github/workflows/ci.yml

@@ -53,16 +53,18 @@ jobs:
                 php-version: ${{ matrix.php }}
                 ini-values: max_input_vars=5000
                 coverage: xdebug
-        
+
             - name: Initialise moodle-plugin-ci
               if: ${{ !cancelled() }}
               run: |
                 composer create-project -n --no-dev --prefer-dist moodlehq/moodle-plugin-ci ci ^4
                 echo $(cd ci/bin; pwd) >> $GITHUB_PATH
                 echo $(cd ci/vendor/bin; pwd) >> $GITHUB_PATH
                 sudo locale-gen en_AU.UTF-8
-                echo "NVM_DIR=$HOME/.nvm" >> $GITHUB_ENV
-      
+                # Install nvm v0.39.7 as a temporary workaround for issue:
+                # https://github.com/moodlehq/moodle-plugin-ci/issues/309
+                curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.7/install.sh | bash
+
             - name: Install moodle-plugin-ci
               if: ${{ !cancelled() }}
               run: moodle-plugin-ci install --plugin ./plugin --db-host=127.0.0.1