CI: Speed up repo syncing

* Include .repo directory in cache to greatly speed up sync
* Add additional parameters to repo sync to ensure we use the revisions set in
manifest when using cache

.gitlab-ci-template.yml

@@ -34,7 +34,7 @@ variables:
     # setup build dir
     - cd ${CI_PROJECT_DIR}
     - ~/repo init -u ${MANIFEST_URL} -b ${CI_DEFAULT_BRANCH}
-    - ~/repo sync --force-sync
+    - ~/repo sync --detach --current-branch --no-tags --force-remove-dirty --optimized-fetch --force-sync
 
 .checkout_commit: &checkout_commit
     # checkout the commit that triggered the pipeline
@@ -50,6 +50,7 @@ prepare_environment:
   tags:
     - builds
   stage: prepare
+  timeout: 10m
   before_script:
     - *setup_ssh
   script:
@@ -60,7 +61,7 @@ prepare_environment:
   artifacts:
     expire_in: 3h
     paths:
-      - "*"
+      - "./"
   cache:
     untracked: false
     key:
@@ -68,12 +69,14 @@ prepare_environment:
         - .repo/manifests/default.xml
       prefix: layers
     paths:
-      - "sources/*/{[^.git]}*/*"
+      # - "sources/*/{[^.git]}*/*"
+      - "./"
 
 .build:
   tags:
     - builds
   stage: build
+  timeout: 8h
   variables:
     SETUPSCRIPT: "setup-environment"
     IMAGEPATH: "tmp/deploy/images"