Dev: add pylint to check ill-formated string literals

This pull request added pylint with a minimal configuration, enabling
only string checks.

See ClusterLabs#1601.

.github/workflows/crmsh-ci.yml

@@ -27,6 +27,8 @@ jobs:
                 echo "Please run ./update-data-manifest.sh && git add ./data-manifest in your local environment and push the code again."
                 exit 1
         }
+        sudo apt-get update && sudo apt-get install pylint
+        pylint --rcfile pylint.toml crmsh
 
   unit_test:
     runs-on: ubuntu-24.04

pylint.toml

@@ -0,0 +1,23 @@
+[tool.pylint.main]
+# Use multiple processes to speed up Pylint. Specifying 0 will auto-detect the
+# number of processors available to use, and will cap the count on Windows to
+# avoid hangs.
+jobs = 0
+
+[tool.pylint."messages control"]
+# Disable the message, report, category or checker with the given id(s). You can
+# either give multiple identifiers separated by comma (,) or put this option
+# multiple times (only on the command line, not in the configuration file where
+# it should appear only once). You can also use "--disable=all" to disable
+# everything first and then re-enable specific checks. For example, if you want
+# to run only the similarities checker, you can use "--disable=all
+# --enable=similarities". If you want to run only the classes checker, but have
+# no Warning level messages displayed, use "--disable=all --enable=classes
+# --disable=W".
+disable = ["all"]
+
+# Enable the message, report, category or checker with the given id(s). You can
+# either give multiple identifier separated by comma (,) or put this option
+# multiple time (only on the command line, not in the configuration file where it
+# should appear only once). See also the "--disable" option for examples.
+enable = ["string"]