Merge pull request #5866 from inspec/cw/purge-git-cache-in-omnibus-4

Always purge omnibus git cache - inspec-4

.expeditor/config.yml

@@ -18,11 +18,16 @@ pipelines:
      - HAB_NOCOLORING: "true"
      - HAB_STUDIO_SECRET_HAB_NONINTERACTIVE: "true"
  - docker/build
- - omnibus/release
+ - omnibus/release:
+    env:
+     # The git cache is corrupt more often than not. This always purges the cache.
+     # https://chefio.atlassian.net/wiki/spaces/RELENGKB/pages/2204336129/Resolving+git+cache+build+errors+in+Omnibus
+     - EXPIRE_CACHE: 1
  - omnibus/adhoc:
     definition: .expeditor/release.omnibus.yml
     env:
      - ADHOC: true
+     - EXPIRE_CACHE: 1
  - verify:
     description: Pull Request validation tests
     public: true