Fix publish-on-sdkman.sh and how it is called in the GH workflow

.github/workflows/verify.yaml

@@ -218,5 +218,7 @@ jobs:
         asset_name: mvnd-${{ env.VERSION }}-windows-amd64.zip
         asset_content_type: application/zip
 
+    - uses: actions/checkout@v1
+
     - name: Publish on sdkman.io
       run: ./build/publish-on-sdkman.sh "${{ env.VERSION }}"

RELEASING.adoc

@@ -6,6 +6,6 @@
 ----
 
 * Re-run the https://github.com/mvndaemon/mvnd/actions?query=workflow%3A%22Mvnd+Changelog%22[Changelog update] manually.
-* When it terminates, find the anchor of the released tag in the
-  https://github.com/mvndaemon/mvnd/blob/master/CHANGELOG.md[Changelog] by clicking the chain link on the left.
-* Wait for the release job to finish, paste the link to changelog to the release.
+* When it terminates, find the section about the current release
+  in the https://raw.githubusercontent.com/mvndaemon/mvnd/master/CHANGELOG.md[Changelog] and copy its MarkDown source
+  to the respective release page. The release page will appear once the release build is finished.

build/publish-on-sdkman.sh

@@ -83,8 +83,8 @@ RESPONSE="$(curl -s -X POST \
     -H "Consumer-Token: ${SDKMAN_CONSUMER_TOKEN}" \
     -H "Content-Type: application/json" \
     -H "Accept: application/json" \
-    -d '{"text": "mvnd '${VERSION}' released '${RELEASE_URL}'"}' \
-    https://vendors.sdkman.io/announce/freeform)"
+    -d '{"candidate": "mvnd", "version": "'${VERSION}'", "url": "'${RELEASE_URL}'"}' \
+    https://vendors.sdkman.io/announce/struct)"
 
 node -pe "
     var json = JSON.parse(process.argv[1]);