[NOTFORMERGE PATCH v2 3/3] gitlab-ci-edk2.yml: Use ccache

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

By using ccache we reduce the job duration from
  36 minutes 28 seconds: https://gitlab.com/philmd/qemu/-/jobs/395823729
to
  29 minutes 15 seconds: https://gitlab.com/philmd/qemu/-/jobs/395840851

  Running after script...
  $ ccache --show-stats
  cache hit (direct)                  6604
  files in cache                     12090
  cache size                         335.5 MB

For now downloading this cache takes 16 seconds, archiving
it 44 seconds.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
We prefer to not use ccache to build the EDK2 firmware binaries, see:

https://www.mail-archive.com/qemu-devel@nongnu.org/msg668616.html

 .gitlab-ci-edk2.yml          | 13 +++++++++++--
 .gitlab-ci.d/edk2/Dockerfile |  3 +++
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/.gitlab-ci-edk2.yml b/.gitlab-ci-edk2.yml
index 088ba4b43a..50b8aee6b7 100644
--- a/.gitlab-ci-edk2.yml
+++ b/.gitlab-ci-edk2.yml
@@ -10,7 +10,7 @@ docker-edk2:
  - docker:19.03.1-dind
  variables:
   GIT_DEPTH: 3
-  IMAGE_TAG: $CI_REGISTRY_IMAGE:edk2-cross-build
+  IMAGE_TAG: $CI_REGISTRY_IMAGE:edk2-cross-build-ccache
   # We don't use TLS
   DOCKER_HOST: tcp://docker:2375
   DOCKER_TLS_CERTDIR: ""
@@ -38,12 +38,21 @@ build-edk2:
    - pc-bios/edk2-licenses.txt
    - edk2-stdout.log
    - edk2-stderr.log
- image: $CI_REGISTRY_IMAGE:edk2-cross-build
+ image: $CI_REGISTRY_IMAGE:edk2-cross-build-ccache
  variables:
    GIT_DEPTH: 3
+   CCACHE_DIR: ${CI_PROJECT_DIR}/.ccache
+ cache: # Use the same cache for all EDK2 jobs
+   key: edk2-cross-build-ccache
+   paths:
+   - ${CCACHE_DIR}
+ before_script:
+ - ccache --zero-stats
  script: # Clone the required submodules and build EDK2
  - git submodule update --init roms/edk2
  - git -C roms/edk2 submodule update --init
  - export JOBS=$(($(getconf _NPROCESSORS_ONLN) + 1))
  - echo "=== Using ${JOBS} simultaneous jobs ==="
  - make -j${JOBS} -C roms efi 2>&1 1>edk2-stdout.log | tee -a edk2-stderr.log >&2
+ after_script:
+ - ccache --show-stats
diff --git a/.gitlab-ci.d/edk2/Dockerfile b/.gitlab-ci.d/edk2/Dockerfile
index b4584d1cf6..350b4df240 100644
--- a/.gitlab-ci.d/edk2/Dockerfile
+++ b/.gitlab-ci.d/edk2/Dockerfile
@@ -13,6 +13,7 @@ RUN apt update \
     apt install --assume-yes --no-install-recommends \
         build-essential \
         ca-certificates \
+        ccache \
         dos2unix \
         gcc-aarch64-linux-gnu \
         gcc-arm-linux-gnueabi \
@@ -25,3 +26,5 @@ RUN apt update \
     && \
     \
     rm -rf /var/lib/apt/lists/*
+
+ENV PATH /usr/lib/ccache:$PATH
-- 
2.21.1