Github action: allow errors from pre-existing artifact download (thos…

…e that come from Cirrus CI) for CI packages, to deal with absent Cirrus artifacts due to Cirrus monthly compute limits.

While here, bump the fetch-gh-release-asset version to latest released v1.1.1 (fixes Github API deprecation warning)

.github/actions/upload-to-github/action.yml

@@ -28,7 +28,10 @@ runs:
     - name: Download existing artifacts from GitHub release
       # only enabled for the upstream repo by default - (probably) needs an existing release
       if: github.repository == 'ldc-developers/ldc'
-      uses: dsaltares/fetch-gh-release-asset@1.0.0
+      # fetch-gh-release-asset errors if there are no existing artifacts (from Cirrus). Allow the error
+      # for CI builds, because Cirrus sometimes exceeds monthly limit (and thus no artifacts).
+      continue-on-error: ${{ env.GITHUB_RELEASE_TAG == 'CI' }}
+      uses: dsaltares/fetch-gh-release-asset@1.1.1
       with:
         version: tags/${{ env.GITHUB_RELEASE_TAG }}
         regex: true