.gitlab-ci.yml, Makefile: put build artifacts in $CI_PROJECT_DIR

GitLab CI system has a constraint that requires all artifact files to be
placed in a sub-directory of $CI_PROJECT_DIR - aka the place where the
project is automatically checked out by the GitLab runner. Since our
project is manifest-based, we use a temporary scratch directory where
the entire structure is created.

Override `make` invocation, so that it builds the project from the
scratch directory into a build sub-directory of CI_PROJECT_DIR.

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@huawei.com>

.gitlab-ci.yml

@@ -58,7 +58,7 @@ build:
   stage: build
   script:
     - *doc-workspace-do
-    - make
+    - make BUILD_DIR="$CI_PROJECT_DIR/build"
   artifacts:
     paths:
       - build

Makefile

 # SPDX-License-Identifier: Apache-2.0
 # SPDX-FileCopyrightText: Huawei Inc.
 
+BUILD_DIR ?= build
+
 .PHONY: all
-all: build
+all: $(BUILD_DIR)
 
 .PHONY: clean
 clean:
 	rm -rf build
 
-build:
-	sphinx-build -W . build
+SRC_DIR ?= .
+# XXX: cannot add true dependencies because some file names contain spaces.
+$(BUILD_DIR):
+	sphinx-build -W $(SRC_DIR) $(BUILD_DIR)