fix: CI pass absolute ARCHIPELAGO_BIN path through sudo

sudo doesn't inherit env vars. Use absolute path and pass it
explicitly so the ISO build finds the freshly built binary
instead of falling through to podman build from source.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/build-iso.yml

@@ -36,8 +36,10 @@ jobs:
       - name: Build unbundled ISO
         run: |
           cd image-recipe
-          sudo UNBUNDLED=1 DEV_SERVER=localhost BUILD_FROM_SOURCE=0 \
-            ARCHIPELAGO_BIN=../core/target/release/archipelago \
+          export ARCHIPELAGO_BIN="$(pwd)/../core/target/release/archipelago"
+          ls -la "$ARCHIPELAGO_BIN" || echo "WARNING: binary not found"
+          sudo -E UNBUNDLED=1 DEV_SERVER=localhost BUILD_FROM_SOURCE=0 \
+            ARCHIPELAGO_BIN="$ARCHIPELAGO_BIN" \
             ./build-auto-installer-iso.sh
 
       - name: Copy to Builds