Simplify the trigger job summary

Drop the heading and the "override" wording - just one plain line per
build. Use core.summary.addRaw per-line (with EOL) instead of joining
with a single newline, since raw markdown lines need an explicit EOL
between them to render as separate lines rather than one squashed
paragraph. Shows the actual derived environment (mirroring resolve-env's
own logic) rather than an often-blank override value.

Author: recrwplay

.github/workflows/docs-trigger-builds.yml

@@ -105,10 +105,11 @@ jobs:
         uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
         env:
           BUILDS: ${{ needs.prepare-ref-env.outputs.builds }}
+          PROD_BRANCH: ${{ env.PROD_BRANCH }}
         with:
           script: |
             const builds = JSON.parse(process.env.BUILDS)
-            const lines = []
+            const prodBranch = process.env.PROD_BRANCH
             for (const build of builds) {
               await github.rest.actions.createWorkflowDispatch({
                 owner: context.repo.owner,
@@ -130,11 +131,11 @@ jobs:
                   'publish-env': build.publishEnv,
                 },
               })
-              const envNote = build.publishEnv ? ` (publish-env override: \`${build.publishEnv}\`)` : ''
-              lines.push(`- \`docs-generate-html.yml\` for build-ref \`${build.buildRef}\`${envNote}`)
+              // Mirrors resolve-env's own derivation for display purposes only - the
+              // real derivation happens inside the dispatched run, this is just to show
+              // what it will resolve to when no explicit override was passed.
+              const env = build.publishEnv || (build.buildRef === prodBranch ? 'prod' : 'dev')
+              core.summary.addRaw(`Triggered \`docs-generate-html.yml\` on branch \`${build.buildRef}\` for \`${env}\``, true)
             }
 
-            await core.summary
-              .addHeading('Triggered builds')
-              .addRaw(lines.join('\n'))
-              .write()
+            await core.summary.write()