[gnome-build-meta/barthalion/x86_64-local-cache] .gitlab-ci.yml: Use Docker volume for caching sources

[Bartłomiej Piotrowski <bpiotrowski src gnome org>]

commit 443d1a399845ce0048101029ed92cf9200b0604e
Author: Bartłomiej Piotrowski <bpiotrowski gnome org>
Date:   Wed Jul 29 22:36:54 2020 +0200

    .gitlab-ci.yml: Use Docker volume for caching sources

 .gitlab-ci.yml | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 133fe827..4b778169 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -49,6 +49,8 @@ default:
           client-key: client.key
           client-cert: client.crt
           push: true
+
+    sourcedir: /cache/buildstream/sources
     EOF
 
   - |
@@ -104,12 +106,6 @@ default:
 
   - ${BST} --max-jobs $(( $(nproc) / 4 )) -o arch "${ARCH}" build "${TARGETS[@]}"
 
-  # Store all the downloaded git repos and tarballs in the cache.
-  # This saves us fetching them on every build
-  cache: &bst-cache
-    key: bst-$FLATPAK_BRANCH
-    paths:
-    - "${XDG_CACHE_HOME}/buildstream/sources/"
   # Store artifacts so we can inspect build failures
   artifacts:
     when: always
@@ -128,7 +124,6 @@ default:
   - if: $CI_MERGE_REQUEST_ID == null
     when: manual
     allow_failure: true
-  cache: *bst-cache
   artifacts:
     when: always
     paths:
@@ -253,7 +248,6 @@ track:
   # only run on branches targeting master
   rules:
   - if: $FLATPAK_BRANCH == 'master' && $CI_MERGE_REQUEST_ID == null
-  cache: *bst-cache
   artifacts:
     paths:
     - project.refs
@@ -296,7 +290,6 @@ pinebook-pro-image:
     - ${BST_NO_PUSH} -o arch "${ARCH}" checkout --hardlinks boards/pinebook-pro/image.bst pinebook-pro-image
   when: manual
   allow_failure: true
-  cache: *bst-cache
   artifacts:
     when: always
     paths:
@@ -316,7 +309,6 @@ rock64-image:
     - ${BST_NO_PUSH} -o arch "${ARCH}" checkout --hardlinks boards/rock64/image.bst rock64
   when: manual
   allow_failure: true
-  cache: *bst-cache
   artifacts:
     when: always
     paths:
@@ -336,7 +328,6 @@ raspberrypi-4-image:
     - ${BST_NO_PUSH} -o arch "${ARCH}" checkout --hardlinks boards/raspberrypi-4/image.bst 
raspberrypi-4-image
   when: manual
   allow_failure: true
-  cache: *bst-cache
   artifacts:
     when: always
     paths: