Fix publish workflow to only build devel branch

The publish workflow was still using `make static-all` which attempts to
build all release branches. This fails because different branches require
different Hugo versions and themes (old branches use hugo-theme-learn
while devel now uses hugo-theme-relearn).

This change mirrors the fix in f01c92a which updated build.yml to use
`make static` instead. Additionally, the workflow now only triggers on
the devel branch since release branches don't get a site published
anyway, and running publish from a release branch would only publish
that branch's content, which would be incomplete.

Fixes the publish job failure after PR #1322 was merged.

Signed-off-by: Tom Pantelis <tompantelis@gmail.com>

Author: tpantelis

.github/workflows/publish.yml

@@ -5,7 +5,6 @@ on:
   push:
     branches:
       - devel
-      - 'release-*'
 
 permissions: {}
 
@@ -33,8 +32,8 @@ jobs:
         env:
           GIT_DEPLOY_KEY: ${{ secrets.GIT_DEPLOY_KEY }}
 
-      - name: Build the website static files for each release
-        run: make static-all
+      - name: Build the website static files
+        run: make static
 
       - name: Push the updated static files
         run: ./scripts/publish