Only make directory if it doesn't exist yet

Author: tmadlener

.github/workflows/key4hep.yml

@@ -26,7 +26,7 @@ jobs:
         view-path: /cvmfs/${{ matrix.release }}
         run: |
           echo "::group::Run CMake"
-          mkdir build install
+          mkdir -p build install
           cd build
           cmake -DENABLE_SIO=ON \
             -DENABLE_JULIA=OFF \

.github/workflows/sanitizers.yaml

@@ -36,7 +36,7 @@ jobs:
           release-platform: LCG_106b/x86_64-el9-${{ matrix.compiler }}-opt
           run: |
             echo "::group::Run CMake"
-            mkdir build
+            mkdir -p build
             cd build
             cmake -DCMAKE_BUILD_TYPE=Debug \
               -DUSE_SANITIZER=${{ matrix.sanitizer }} \

.github/workflows/ubuntu.yml

@@ -26,7 +26,7 @@ jobs:
         run: |
           echo "::group::Run CMake"
           export JULIA_DEPOT_PATH="$(mktemp -d -p /tmp -t julia_depot_XXXXX):"
-          mkdir build install
+          mkdir -p build install
           cd build
           cmake -DENABLE_SIO=ON \
             -DENABLE_JULIA=ON \