Check starcatcher credentials early

It's infuriating when the entire workflow fails at the publish stage because Discord pretends to have markdown.

.github/starcatcher-publish.sh

@@ -13,6 +13,8 @@ chmod 660 ~/.netrc
 mountpoint=ftpmnt
 mkdir $mountpoint
 curlftpfs "$PUBLISH_HOSTPORT" $mountpoint -o ssl,ciphers='ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:DHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES128-SHA:DHE-RSA-AES128-GCM-SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256:TLS_AES_128_GCM_SHA256:TLS_AES_128_CCM_8_SHA256:TLS_AES_128_CCM_SHA256'
-cp $PUBLISH_FILENAME $mountpoint/${PUBLISH_DIRECTORY:-.}/
+if [[ -z ${PUBLISH_ACCESSCHECK-} ]]; then
+	cp $PUBLISH_FILENAME $mountpoint/${PUBLISH_DIRECTORY:-.}/
+fi
 fusermount -u $mountpoint
 rmdir $mountpoint

.github/workflows/build.yaml

@@ -41,6 +41,13 @@ jobs:
         env:
           PUBLISH_HOSTPORT: ${{ secrets.STARCATCHER_PUBLISH_HOSTPORT }}
           GITHUB_REF: ${{ github.ref }}
+      - if: steps.prepare.outputs.do_publish == 'yes'
+        run: sudo apt update && sudo apt install curlftpfs && bash -c './.github/starcatcher-publish.sh'
+        env:
+          PUBLISH_HOSTPORT: ${{ secrets.STARCATCHER_PUBLISH_HOSTPORT }}
+          PUBLISH_USERNAME: ${{ secrets.STARCATCHER_PUBLISH_USERNAME }}
+          PUBLISH_PASSWORD: ${{ secrets.STARCATCHER_PUBLISH_PASSWORD }}
+          PUBLISH_ACCESSCHECK: yes
       - if: steps.prepare.outputs.do_release == 'yes'
         id: create_release
         env: