Merge #205: cmake: Fix "tidy" CI job

de15de4 fixup! ci: Migrate CI scripts to CMake (Hennadii Stepanov)
e59e96d fixup! ci: Migrate CI scripts to CMake (Hennadii Stepanov)

Pull request description:

  Fixes the first point from bitcoin#29790 (comment):
  >    1. `Cannot open mapping file '/ci_container_base/ci/scratch/build-/contrib/devtools/iwyu/bitcoin.core.imp': No such file or directory.`

Top commit has no ACKs.

Tree-SHA512: ebead6da2729620237703d05b6cbf9b5ad73f139a9020f3785f0c9e89054fbaddd4c5ae687278042c6b467359a2e0e641f09d5f3d5c37429a558f508832c6f2d

Author: hebasto

ci/test/00_setup_env.sh

@@ -61,8 +61,6 @@ export CCACHE_COMPRESS=${CCACHE_COMPRESS:-1}
 export CCACHE_DIR=${CCACHE_DIR:-$BASE_SCRATCH_DIR/.ccache}
 # Folder where the build result is put (bin and lib).
 export BASE_OUTDIR=${BASE_OUTDIR:-$BASE_SCRATCH_DIR/out}
-# Folder where the build is done (dist and out-of-tree build).
-export BASE_BUILD_DIR=${BASE_BUILD_DIR:-$BASE_SCRATCH_DIR/build-$HOST}
 # The folder for previous release binaries.
 # This folder exists only on the ci guest, and on the ci host as a volume.
 export PREVIOUS_RELEASES_DIR=${PREVIOUS_RELEASES_DIR:-$BASE_ROOT_DIR/prev_releases}

ci/test/03_test_script.sh

@@ -110,6 +110,8 @@ fi
 ccache --zero-stats
 PRINT_CCACHE_STATISTICS="ccache --version | head -n 1 && ccache --show-stats"
 
+# Folder where the build is done.
+BASE_BUILD_DIR=${BASE_BUILD_DIR:-$BASE_SCRATCH_DIR/build-$HOST}
 mkdir -p "${BASE_BUILD_DIR}"
 cd "${BASE_BUILD_DIR}"
 
@@ -178,7 +180,7 @@ if [ "${RUN_TIDY}" = "true" ]; then
   cd "${BASE_ROOT_DIR}"
   python3 "/include-what-you-use/iwyu_tool.py" \
            -p "${BASE_BUILD_DIR}" "${MAKEJOBS}" \
-           -- -Xiwyu --cxx17ns -Xiwyu --mapping_file="${BASE_BUILD_DIR}/contrib/devtools/iwyu/bitcoin.core.imp" \
+           -- -Xiwyu --cxx17ns -Xiwyu --mapping_file="${BASE_ROOT_DIR}/contrib/devtools/iwyu/bitcoin.core.imp" \
            -Xiwyu --max_line_length=160 \
            2>&1 | tee /tmp/iwyu_ci.out
   cd "${BASE_ROOT_DIR}/src"