Add delayed run in MRs and change containers to run bash

Dockerfile.shellcheck

@@ -2,7 +2,7 @@ FROM alpine:3.16.1
 ARG GL_COMMON_CI_TASKS_DEFAULT_ASDF_SHELLCHECK_VERSION
-RUN apk add --no-cache grep bash
+RUN apk add --no-cache grep bash pcre
 WORKDIR /tmp
 RUN wget https://github.com/koalaman/shellcheck/releases/download/v${GL_COMMON_CI_TASKS_DEFAULT_ASDF_SHELLCHECK_VERSION}/shellcheck-v${GL_COMMON_CI_TASKS_DEFAULT_ASDF_SHELLCHECK_VERSION}.linux.x86_64.tar.xz -O shellcheck.tar.xz && \

Dockerfile.shfmt

@@ -7,3 +7,5 @@ RUN apk add --no-cache bash findutils grep
 WORKDIR /tmp
 RUN wget https://github.com/mvdan/sh/releases/download/v${GL_COMMON_CI_TASKS_DEFAULT_ASDF_SHFMT_VERSION}/shfmt_v${GL_COMMON_CI_TASKS_DEFAULT_ASDF_SHFMT_VERSION}_linux_amd64 -O /usr/local/bin/shfmt && \
   chmod +x /usr/local/bin/shfmt
+
+CMD [ "/bin/bash" ]

shellcheck.yml

@@ -8,6 +8,8 @@ shellcheck:
     - if: '$CI_PROJECT_NAME == "common-ci-tasks" && $CI_PIPELINE_SOURCE == "merge_request_event"'
       variables:
         IMAGE_TAG: "$CI_COMMIT_REF_SLUG"
+      when: delayed
+      start_in: 30s
   image:
     name: registry.gitlab.com/gitlab-com/gl-infra/common-ci-tasks/shellcheck:${IMAGE_TAG}
   script:

shfmt.yml

@@ -8,6 +8,8 @@ shfmt:
     - if: '$CI_PROJECT_NAME == "common-ci-tasks" && $CI_PIPELINE_SOURCE == "merge_request_event"'
       variables:
         IMAGE_TAG: "$CI_COMMIT_REF_SLUG"
+      when: delayed
+      start_in: 30s
   image:
     name: registry.gitlab.com/gitlab-com/gl-infra/common-ci-tasks/shfmt:${IMAGE_TAG}
   script: