Lint Dockerfile.ci and fix empty line for license comment

Dockerfile.ci

@@ -1271,6 +1271,7 @@ EOF
 # The content below is automatically copied from scripts/docker/install_npm_pnpm_yarn.sh
 COPY <<"EOF" /install_npm_pnpm_yarn.sh
 #!/usr/bin/env bash
+
 . "$( dirname "${BASH_SOURCE[0]}" )/common.sh"
 
 function install_npm_pnpm_yarn() {
@@ -1518,9 +1519,9 @@ ENV AIRFLOW_PRE_CACHED_YARN_PACKAGES=${AIRFLOW_PRE_CACHED_YARN_PACKAGES}
 COPY --from=scripts install_yarn_dependencies_from_branch_tip.sh /scripts/docker/
 
 ENV YARN_CACHE_DIR="${AIRFLOW_SOURCES}/.yarn-cache"
-RUN mkdir -p "${YARN_CACHE_DIR}"
 # We are installing Yarn dependencies here to make sure they are cached in the layer
-RUN if [[ ${AIRFLOW_PRE_CACHED_YARN_PACKAGES} == "true" ]]; then \
+RUN mkdir -p "${YARN_CACHE_DIR}" && \
+    if [[ ${AIRFLOW_PRE_CACHED_YARN_PACKAGES} == "true" ]]; then \
         bash /scripts/docker/install_yarn_dependencies_from_branch_tip.sh; \
     fi
 
@@ -1530,9 +1531,9 @@ ENV AIRFLOW_PRE_CACHED_PNPM_PACKAGES=${AIRFLOW_PRE_CACHED_PNPM_PACKAGES}
 COPY --from=scripts install_pnpm_dependencies_from_branch_tip.sh /scripts/docker/
 
 ENV PNPM_CACHE_DIR="${AIRFLOW_SOURCES}/.pnpm-cache"
-RUN mkdir -p "${PNPM_CACHE_DIR}"
 # We are installing pnpm dependencies here to make sure they are cached in the layer
-RUN if [[ ${AIRFLOW_PRE_CACHED_PNPM_PACKAGES} == "true" ]]; then \
+RUN mkdir -p "${PNPM_CACHE_DIR}" && \
+    if [[ ${AIRFLOW_PRE_CACHED_PNPM_PACKAGES} == "true" ]]; then \
         bash /scripts/docker/install_pnpm_dependencies_from_branch_tip.sh; \
     fi
 

scripts/docker/install_npm_pnpm_yarn.sh

@@ -16,6 +16,7 @@
 # specific language governing permissions and limitations
 # under the License.
 # shellcheck shell=bash disable=SC2086
+
 # shellcheck source=scripts/docker/common.sh
 . "$( dirname "${BASH_SOURCE[0]}" )/common.sh"