Limit to one linking job at the same time.

.github/workflows/continuous.yml

@@ -141,6 +141,9 @@ jobs:
             -DLIBIGL_USE_STATIC_LIBRARY=${{ matrix.static }} ^
             -DLIBIGL_WITH_CGAL=ON ^
             -DLIBIGL_WITH_COMISO=OFF ^
+            -DCMAKE_JOB_POOLS=pool-linking=1;pool-compilation=2 ^
+            -DCMAKE_JOB_POOL_COMPILE:STRING=pool-compilation' ^
+            -DCMAKE_JOB_POOL_LINK:STRING=pool-linking ^
             -B build ^
             -S .
           cmake --build build

.github/workflows/nightly.yml

@@ -178,6 +178,9 @@ jobs:
             -DLIBIGL_BUILD_TUTORIALS=${{ matrix.tutorials }} ^
             -DLIBIGL_WITH_CGAL=ON ^
             -DLIBIGL_WITH_COMISO=OFF ^
+            -DCMAKE_JOB_POOLS=pool-linking=1;pool-compilation=2 ^
+            -DCMAKE_JOB_POOL_COMPILE:STRING=pool-compilation' ^
+            -DCMAKE_JOB_POOL_LINK:STRING=pool-linking ^
             -B build ^
             -S .
           cmake --build build -j 1