github.workflow: reconstruct current release URL from tag

Instead of relying on the "latest" release, we use the actual release tag
to make sure to retrieve the right release.
That does not work better for pre-releases, though.

.github/workflows/make_feed.sh

@@ -1,10 +1,11 @@
 #!/bin/bash
 # Retrieves the latest release output to generate a QiToolchain XML feed.
 set -e
-echo "Getting packages from current release at ${GITHUB_API_URL}/repos/${GITHUB_REPOSITORY}/releases/latest"
-ASSETS_URL=$(curl --silent "${GITHUB_API_URL}/repos/${GITHUB_REPOSITORY}/releases/latest" |
+RELEASE_URL="${GITHUB_API_URL}/repos/${GITHUB_REPOSITORY}/releases/${CURRENT_RELEASE_TAG}"
+echo "Getting packages from current release at $RELEASE_URL"
+ASSETS_URL=$(curl --silent $RELEASE_URL |
     jq -r '.assets_url')
-PACKAGES_URLS=$(curl --silent ${ASSETS_URL} |
+PACKAGES_URLS=$(curl --silent $ASSETS_URL |
     jq '.[] | .browser_download_url' |
     grep .zip | xargs -L 1 echo) # echo removes the extra quotes
 

.github/workflows/release.yml

@@ -54,6 +54,8 @@ jobs:
 
     - name: Make Feed # Outputs feed.xml
       run: .github/workflows/make_feed.sh
+      env:
+        CURRENT_RELEASE_TAG: ${{ steps.release.outputs.automatic_releases_tag }}
 
     - name: Release Feed
       uses: actions/upload-release-asset@v1