Merge bitcoin#28103: test: Add missing set -ex to ci/lint/06_script.sh

ffff4b5 lint: Add missing `set -ex` to ci/lint/06_script.sh (MarcoFalke)
fadc523 doc: Add doc comment to ci/test_imagefile (MarcoFalke)

Pull request description:

  Requested in bitcoin#28083 (review).

  Also, one doc commit.

ACKs for top commit:
  fanquake:
    ACK ffff4b5
  jamesob:
    ACK ffff4b5 ([`jamesob/ackr/28103.1.MarcoFalke.test_add_missing_set_ex`](https://github.com/jamesob/bitcoin/tree/ackr/28103.1.MarcoFalke.test_add_missing_set_ex))

Tree-SHA512: 99e67aeaae460319c2c428eab5297dbe1f1dc7f162f6592380bc5d2005308300c391cc187959cb2ace486dfe3411a8b0477f703ff11b5fe33944942c210a2d32

ci/lint/06_script.sh

@@ -6,6 +6,8 @@
 
 export LC_ALL=C
 
+set -ex
+
 if [ -n "$LOCAL_BRANCH" ]; then
   # To faithfully recreate CI linting locally, specify all commits on the current
   # branch.

ci/lint/docker-entrypoint.sh → ci/lint/container-entrypoint.sh

@@ -1,4 +1,9 @@
 #!/usr/bin/env bash
+#
+# Copyright (c) The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or https://opensource.org/license/mit/.
+
 export LC_ALL=C
 
 # Fixes permission issues when there is a container UID/GID mismatch with the owner

ci/lint_imagefile

@@ -1,3 +1,7 @@
+# Copyright (c) The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or https://opensource.org/license/mit/.
+
 # See test/lint/README.md for usage.
 
 FROM debian:bookworm
@@ -6,7 +10,7 @@ ENV DEBIAN_FRONTEND=noninteractive
 ENV LC_ALL=C.UTF-8
 
 COPY ./.python-version /.python-version
-COPY ./ci/lint/docker-entrypoint.sh /entrypoint.sh
+COPY ./ci/lint/container-entrypoint.sh /entrypoint.sh
 COPY ./ci/lint/04_install.sh /install.sh
 
 RUN /install.sh && \

ci/lint_run_all.sh

@@ -8,4 +8,5 @@ export LC_ALL=C.UTF-8
 
 set -o errexit; source ./ci/test/00_setup_env.sh
 set -o errexit; source ./ci/lint/04_install.sh
-set -o errexit; source ./ci/lint/06_script.sh
+set -o errexit
+./ci/lint/06_script.sh

ci/test_imagefile

@@ -1,3 +1,9 @@
+# Copyright (c) The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or https://opensource.org/license/mit/.
+
+# See ci/README.md for usage.
+
 ARG CI_IMAGE_NAME_TAG
 FROM ${CI_IMAGE_NAME_TAG}