CircleCI cache: have all cache layers caching packages directory.

Heads buildstystem:
-Makefile logic will download packages, check its integrity, extract and patch extracted directory if no corresponding .*_verify files are found under packages directory.
-build/module* .configured is written when packages are configured under build/modulename-ver/.configured
-build/modules* .build is written when packages are built under build/modulename-ver/.build

Consequently:
-CircleCI cache should include packages cache (so that packages are downloaded and verified once.)
-Heads Makefile only downloads, checks and extracts packages, and then patch extracted directory content if packages/.module-version_verify doesn't exist.

Author: tlaurion

.circleci/config.yml

@@ -158,19 +158,19 @@ jobs:
           #CircleCI removed their wildcard support, so we have to list precise versions to cache in directory names
           key: heads-musl-cross-{{ checksum "./tmpDir/musl-cross.sha256sums" }}{{ .Environment.CACHE_VERSION }}
           paths:
+            - packages
             - crossgcc
             - build/musl-cross-38e52db8358c043ae82b346a2e6e66bc86a53bc1
       - save_cache:
           #Generate cache for the same coreboot mnd musl-cross-make modules definition if hash is not previously existing
           #CircleCI removed their wildcard support, so we have to list precise versions to cache in directory names
           key: heads-coreboot-musl-cross-{{ checksum "./tmpDir/coreboot_musl-cross.sha256sums" }}{{ .Environment.CACHE_VERSION }}
           paths:
+            - packages
             - build/coreboot-4.11
             - build/coreboot-4.13
             - build/coreboot-4.14
             - build/coreboot-4.15
-            - crossgcc
-            - build/musl-cross-38e52db8358c043ae82b346a2e6e66bc86a53bc1
       - save_cache:
           #Generate cache for the exact same modules definitions if hash is not previously existing
           key: heads-modules-and-patches-{{ checksum "./tmpDir/all_modules_and_patches.sha256sums" }}{{ .Environment.CACHE_VERSION }}