Merge branch '8-ci' into 'master'

Resolve "CI"

Closes #8

See merge request !6

.gitlab-ci.yml

+# This file is a template, and might need editing before it works on your project.
+# This is a sample GitLab CI/CD configuration file that should run without any modifications.
+# It demonstrates a basic 3 stage CI/CD pipeline. Instead of real tests or scripts,
+# it uses echo commands to simulate the pipeline execution.
+#
+# A pipeline is composed of independent jobs that run scripts, grouped into stages.
+# Stages run in sequential order, but jobs within stages run in parallel.
+#
+# For more information, see: https://docs.gitlab.com/ee/ci/yaml/index.html#stages
+#
+# You can copy and paste this template into a new `.gitlab-ci.yml` file.
+# You should not add this template to an existing `.gitlab-ci.yml` file by using the `include:` keyword.
+#
+# To contribute improvements to CI/CD templates, please follow the Development guide at:
+# https://docs.gitlab.com/ee/development/cicd/templates.html
+# This specific template is located at:
+# https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/ci/templates/Getting-Started.gitlab-ci.yml
+
+image: debian:bullseye-slim
+
+before_script:
+  - apt-get update
+  - apt-get -y install shellcheck
+
+stages:          # List of stages for jobs, and their order of execution
+  - test
+
+test-job:   # This job runs in the test stage.
+  stage: test    # It only starts when the job in the build stage completes successfully.
+  script:
+    - shellcheck --color=always --shell=bash "validate_workflow.sh"

.shellcheckrc

+### ENABLE SOME OPTIONAL CHECKS
+# use "shellcheck --list-optional" to list available checks
+enable=add-default-case
+enable=avoid-nullary-conditions
+enable=require-variable-braces
+
+
+
+### DISABLE CHECKS
+
+# https://github.com/koalaman/shellcheck/wiki/SC1091
+disable=SC1091
+
+# https://github.com/koalaman/shellcheck/issues/2457
+disable=SC2020