Add multi-branch GitHub Pages publishing for rendered ZIP docs

.github/workflows/multi-branch-pages.yml

@@ -0,0 +1,29 @@
+name: Publish multi-branch ZIP pages
+
+on:
+  push:
+    branches:
+      - "**"
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+jobs:
+  publish:
+    uses: shielded-nate/multi-branch-pages/.github/workflows/publish-multi-branch-pages.yml@7877d18060b344723fdafd145aeeaee6ee9e7361
+    with:
+      branch_whitelist: "*"
+      render_command: |
+        if ! command -v nix >/dev/null 2>&1; then
+          curl -fsSL https://install.determinate.systems/nix | sh -s -- install --no-confirm
+        fi
+        if [ -e /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh ]; then
+          . /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
+        elif [ -e "$HOME/.nix-profile/etc/profile.d/nix.sh" ]; then
+          . "$HOME/.nix-profile/etc/profile.d/nix.sh"
+        fi
+        nix develop --command make all-zips
+      render_output_dir: rendered

.github/workflows/publish.yaml

@@ -1,8 +1,7 @@
 name: Deploy Rendered Site
 
 on:
-  push:
-    branches: [ main ]
+  workflow_dispatch:
 
 env:
   CARGO_TERM_COLOR: always