ci: Introduce Terraform 1.6 and 1.7 in CI workflows, fix README and update test skeleton version

[sebastianczech]

Description

PR delivers multiple improvements:

• Terraform 1.6 and 1.7 is added in CI workflows
• problem with white characters in README is fixed
• version of terraform-modules-swfw-tests-skeleton is updated

Motivation and Context

• Since this version of Terraform is officially supported by the modules, test should be run using this version.
• With white characters there were issues with pre-commit (please check failed first /sca ChatOps command).
• There were errors while executing tests (please check failed first /plan ChatOps command), so version of terraform-modules-swfw-tests-skeleton was increased (after renaming package from terraform-modules-vmseries-tests-skeleton)

How Has This Been Tested?

Changes was tested using ChatOps. Please check PR comments.

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist

• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes if appropriate.
• [x] All new and existing tests passed.

[sebastianczech]

/sca

Testing job ID: 7725450923 Job result: FAILURE

[sebastianczech]

/help

ChatOPS built in help:

Currently supported commands include:

• /sca - run all SCA tests via pre-commit
• /validate - run terraform validate
• /plan - plan the infrastructure (only examples)
• /apply - deploy the infrastructure and destroy afterwards (only examples)
• /idempotence - test idempotence: deploy, plan and destroy afterwards (only examples).

The 1^st command does not take arguments, the remaining take two:

• paths - a space delimitied list of module paths
• tf_version - (optional, defaults to the latest available) a space delimited list of Terraform versions to test the infrastrucure against.

Examples:

# run idempotence tests on listed modules with Terraform versions: 1.2 (latest patch available), 1.4 (latest patch available), 1.5.4.
/idempotence paths="examples/combined_design examples/panorama_standalone" tf_version="1.2 1.4 1.5.4"

# run validation tests with the latest available Terraform version on listed modules.
/validate paths="modules/vmseries modules/vpc examples/combined_design"

[sebastianczech]

/plan paths="examples/centralized_design examples/centralized_design_autoscale examples/combined_design examples/combined_design_autoscale examples/isolated_design examples/isolated_design_autoscale examples/panorama_standalone examples/vmseries_standalone" tf_version="1.7"

Testing job ID: 7725472191 Job result: FAILURE

[sebastianczech]

/sca

Testing job ID: 7725549224 Job result: SUCCESS

[sebastianczech]

/plan paths="examples/centralized_design examples/centralized_design_autoscale examples/combined_design examples/combined_design_autoscale examples/isolated_design examples/isolated_design_autoscale examples/panorama_standalone examples/vmseries_standalone" tf_version="1.7"

Testing job ID: 7725593052 Job result: SUCCESS

[sebastianczech]

/idempotence paths="examples/centralized_design examples/centralized_design_autoscale examples/combined_design examples/combined_design_autoscale examples/isolated_design examples/isolated_design_autoscale examples/panorama_standalone examples/vmseries_standalone" tf_version="1.7"

Testing job ID: 7725615285 Job result: FAILURE Job result: SUCCESS

[sebastianczech]

/plan paths="examples/centralized_design examples/centralized_design_autoscale examples/combined_design examples/combined_design_autoscale examples/isolated_design examples/isolated_design_autoscale examples/panorama_standalone examples/vmseries_standalone" tf_version="1.6"

Testing job ID: 7726031836 Job result: SUCCESS