Pass --include-build-deps in the spack deps phase

Spack develop's new installer defers build-type-only deps when
installing from cache, so `--only dependencies` skipped eigen in the
first phase and `--only package` aborted. The `--include-build-deps`
flag forces build-type deps (eigen, cmake, pkgconfig, fortran, etc.)
to install eagerly.

Author: hughcars

.github/actions/palace-ci/action.yml

@@ -224,7 +224,7 @@ runs:
       run: |
         source /tmp/timing_functions.sh
         start_timer
-        spack -e . install --only-concrete --no-check-signature --fail-fast --show-log-on-error --only dependencies --test root -j $(nproc)
+        spack -e . install --only-concrete --no-check-signature --fail-fast --show-log-on-error --include-build-deps --only dependencies --test root -j $(nproc)
         end_timer "Build Dependencies"
 
     - name: Print @develop commit hashes