[gha] mount /var/tmp to 'host' (#16802)

Author: vulkoingim

.github/workflows/build.yml

@@ -83,6 +83,9 @@ jobs:
     runs-on: [ self-hosted ]
     container:
       image: eu.gcr.io/gitpod-core-dev/dev/dev-environment:kylos101-kubecdl-home.1
+      volumes:
+        - /var/tmp:/var/tmp
+        - /tmp:/tmp
     outputs:
       previewctl_hash: ${{ steps.build.outputs.previewctl_hash }}
     steps:
@@ -151,6 +154,9 @@ jobs:
           - 23306:23306
     container:
       image: eu.gcr.io/gitpod-core-dev/dev/dev-environment:kylos101-kubecdl-home.1
+      volumes:
+        - /var/tmp:/var/tmp
+        - /tmp:/tmp
       env:
         DB_HOST: "mysql"
         DB_PORT: "23306"