fix: restore musl static build, brand GRUB as Archipelago

Runner is Debian 13 (glibc 2.41), ISO rootfs is Debian 12/bookworm
(glibc 2.36). Dynamic binary crashes with GLIBC_2.41 not found.
Musl static build eliminates the dependency entirely.

Also set GRUB_DISTRIBUTOR="Archipelago" so installed system boot
menu says "Archipelago" not "Debian GNU/Linux".

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitea/workflows/build-iso-dev.yml

@@ -30,26 +30,32 @@ jobs:
         run: |
           # Skip apt if packages already installed (persistent runner)
           if dpkg -s debootstrap squashfs-tools xorriso isolinux syslinux-common mtools \
-               grub-efi-amd64-bin grub-pc-bin grub-common >/dev/null 2>&1; then
+               grub-efi-amd64-bin grub-pc-bin grub-common musl-tools >/dev/null 2>&1; then
             echo "ISO build deps already installed, skipping apt"
           else
             sudo apt-get update -qq
             sudo apt-get install -y -qq \
               debootstrap squashfs-tools xorriso \
               isolinux syslinux-common mtools \
-              grub-efi-amd64-bin grub-pc-bin grub-common
+              grub-efi-amd64-bin grub-pc-bin grub-common \
+              musl-tools
           fi
+          # Ensure musl Rust target is available
+          source $HOME/.cargo/env 2>/dev/null || true
+          rustup target add x86_64-unknown-linux-musl 2>/dev/null || true
 
-      - name: Build backend (incremental)
+      - name: Build backend (incremental, musl static)
         run: |
           source $HOME/.cargo/env 2>/dev/null || true
           # Build in persistent repo dir to reuse target/ cache
           cd "$HOME/archy"
           export GIT_HASH=$(git rev-parse --short HEAD)
-          cargo build --release --manifest-path core/Cargo.toml
+          # Static musl build — runner is Debian 13 (glibc 2.41) but ISO rootfs
+          # is Debian 12/bookworm (glibc 2.36). Dynamic binary won't run.
+          cargo build --release --target x86_64-unknown-linux-musl --manifest-path core/Cargo.toml
           # Copy binary to workspace for downstream steps
           mkdir -p "$GITHUB_WORKSPACE/core/target/release"
-          cp core/target/release/archipelago "$GITHUB_WORKSPACE/core/target/release/"
+          cp core/target/x86_64-unknown-linux-musl/release/archipelago "$GITHUB_WORKSPACE/core/target/release/"
 
       - name: Build frontend
         run: cd neode-ui && npm ci && npm run build

image-recipe/build-auto-installer-iso.sh

@@ -2564,6 +2564,10 @@ rm -f /mnt/target/etc/initramfs-tools/conf.d/live-boot* 2>/dev/null || true
 rm -f /mnt/target/usr/share/initramfs-tools/scripts/live* 2>/dev/null || true
 rm -f /mnt/target/usr/share/initramfs-tools/hooks/live* 2>/dev/null || true
 
+# Brand GRUB as Archipelago (default says "Debian GNU/Linux")
+sed -i 's/^GRUB_DISTRIBUTOR=.*/GRUB_DISTRIBUTOR="Archipelago"/' /mnt/target/etc/default/grub
+grep -q '^GRUB_DISTRIBUTOR' /mnt/target/etc/default/grub || echo 'GRUB_DISTRIBUTOR="Archipelago"' >> /mnt/target/etc/default/grub
+
 # Suppress os-prober warning in GRUB
 echo "GRUB_DISABLE_OS_PROBER=true" >> /mnt/target/etc/default/grub
 # GFX fallback for hardware without graphical GRUB support