add github action for moodle plugin release.

.github/workflows/moodle-release.yml

@@ -0,0 +1,51 @@
+#
+# Whenever version.php is changed, add the latest version
+# to the Moodle Plugins directory at https://moodle.org/plugins
+#
+# revision: 2021070201
+#
+name: Releasing in the Plugins directory
+
+on:
+  push:
+    paths:
+      - '/version.php'
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  release-at-moodle-org:
+    runs-on: ubuntu-latest
+    env:
+      PLUGIN: mod_attendance
+      BRANCH: MOODLE_311_STABLE
+      CURL: curl -s
+      ENDPOINT: https://moodle.org/webservice/rest/server.php
+      TOKEN: ${{ secrets.MOODLE_ORG_TOKEN }}
+      FUNCTION: local_plugins_add_version
+
+    steps:
+      - name: Call the service function
+        id: add-version
+        run: |
+          ZIPURL="https://github.com/danmarsden/moodle-mod_attendance/archive/refs/heads/{BRANCH}.zip"
+          RESPONSE=$(${CURL} ${ENDPOINT} --data-urlencode "wstoken=${TOKEN}" \
+                                         --data-urlencode "wsfunction=${FUNCTION}" \
+                                         --data-urlencode "moodlewsrestformat=json" \
+                                         --data-urlencode "frankenstyle=${PLUGIN}" \
+                                         --data-urlencode "zipurl=${ZIPURL}" \
+                                         --data-urlencode "vcssystem=git" \
+                                         --data-urlencode "vcsrepositoryurl=${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}" \
+                                         --data-urlencode "vcstag=${TAGNAME}" \
+                                         --data-urlencode "changelogurl=${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/commits/{BRANCH}" \
+                                         --data-urlencode "altdownloadurl=${ZIPURL}")
+          echo "::set-output name=response::${RESPONSE}"
+      - name: Evaluate the response
+        id: evaluate-response
+        env:
+          RESPONSE: ${{ steps.add-version.outputs.response }}
+        run: |
+          jq <<< ${RESPONSE}
+          jq --exit-status ".id" <<< ${RESPONSE} > /dev/null