ci: add option for running tests without volume

DANGER_CI_ON_HOST_CACHE_FOLDERS if set will mount caches in directories on the host rather than in docker volumes. Supports saving and restoring caches on Github Actions.

.github/workflows/ci.yml

@@ -313,6 +313,7 @@ jobs:
     timeout-minutes: 120
     env:
       FILE_ENV: "./ci/test/00_setup_env_native_asan.sh"
+      DANGER_CI_ON_HOST_CACHE_FOLDERS: 1
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -320,6 +321,9 @@ jobs:
       - name: Set Ccache directory
         run: echo "CCACHE_DIR=${RUNNER_TEMP}/ccache_dir" >> "$GITHUB_ENV"
 
+      - name: Set base root directory
+        run: echo "BASE_ROOT_DIR=${RUNNER_TEMP}" >> "$GITHUB_ENV"
+
       - name: Restore Ccache cache
         id: ccache-cache
         uses: actions/cache/restore@v4

ci/test/02_run_container.sh

@@ -30,6 +30,24 @@ if [ -z "$DANGER_RUN_CI_ON_HOST" ]; then
   docker volume create "${CONTAINER_NAME}_depends_sources" || true
   docker volume create "${CONTAINER_NAME}_previous_releases" || true
 
+  CI_CCACHE_MOUNT="type=volume,src=${CONTAINER_NAME}_ccache,dst=$CCACHE_DIR"
+  CI_DEPENDS_MOUNT="type=volume,src=${CONTAINER_NAME}_depends,dst=$DEPENDS_DIR/built"
+  CI_DEPENDS_SOURCES_MOUNT="type=volume,src=${CONTAINER_NAME}_depends_sources,dst=$DEPENDS_DIR/sources"
+  CI_PREVIOUS_RELEASES_MOUNT="type=volume,src=${CONTAINER_NAME}_previous_releases,dst=$PREVIOUS_RELEASES_DIR"
+
+  if [ "$DANGER_CI_ON_HOST_CACHE_FOLDERS" ]; then
+    # ensure the directories exist
+    mkdir -p "${CCACHE_DIR}"
+    mkdir -p "${DEPENDS_DIR}/built"
+    mkdir -p "${DEPENDS_DIR}/sources"
+    mkdir -p "${PREVIOUS_RELEASES_DIR}"
+
+    CI_CCACHE_MOUNT="type=bind,src=${CCACHE_DIR},dst=$CCACHE_DIR"
+    CI_DEPENDS_MOUNT="type=bind,src=${DEPENDS_DIR}/built,dst=$DEPENDS_DIR/built"
+    CI_DEPENDS_SOURCES_MOUNT="type=bind,src=${DEPENDS_DIR}/sources,dst=$DEPENDS_DIR/sources"
+    CI_PREVIOUS_RELEASES_MOUNT="type=bind,src=${PREVIOUS_RELEASES_DIR},dst=$PREVIOUS_RELEASES_DIR"
+  fi
+
   docker network create --ipv6 --subnet 1111:1111::/112 ci-ip6net || true
 
   if [ -n "${RESTART_CI_DOCKER_BEFORE_RUN}" ] ; then
@@ -52,10 +70,10 @@ if [ -z "$DANGER_RUN_CI_ON_HOST" ]; then
   # shellcheck disable=SC2086
   CI_CONTAINER_ID=$(docker run --cap-add LINUX_IMMUTABLE $CI_CONTAINER_CAP --rm --interactive --detach --tty \
                   --mount "type=bind,src=$BASE_READ_ONLY_DIR,dst=$BASE_READ_ONLY_DIR,readonly" \
-                  --mount "type=volume,src=${CONTAINER_NAME}_ccache,dst=$CCACHE_DIR" \
+                  --mount "${CI_CCACHE_MOUNT}" \
-                  --mount "type=volume,src=${CONTAINER_NAME}_depends,dst=$DEPENDS_DIR/built" \
+                  --mount "${CI_DEPENDS_MOUNT}" \
-                  --mount "type=volume,src=${CONTAINER_NAME}_depends_sources,dst=$DEPENDS_DIR/sources" \
+                  --mount "${CI_DEPENDS_SOURCES_MOUNT}" \
-                  --mount "type=volume,src=${CONTAINER_NAME}_previous_releases,dst=$PREVIOUS_RELEASES_DIR" \
+                  --mount "${CI_PREVIOUS_RELEASES_MOUNT}" \
                   --env-file /tmp/env-$USER-$CONTAINER_NAME \
                   --name "$CONTAINER_NAME" \
                   --network ci-ip6net \