add .dockerignore to ignore terraform deployment artifacts

[glennmusa]

Description

A user could run into an issue where they've deployed with one version (e.g. 2.50) of Terraform, thus generating a .terraform.lock.hcl file, while the source references another (e.g. 2.55).

This change ignores any of the terraform directories when building images from /src/ and removes a previously used argument that is no longer necessary from main.py.

Issue reference

The issue this PR will close: #191

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles or validates correctly
• BASH scripts have been validated using shellcheck
• All tests pass (manual and automated)
• The documentation is updated to cover any new or changed features
• Markdown files have been linted using the recommended linter. (See .vscode/extensions.json.)
• Relevant issues are linked to this PR

[jjansen23]

Changes looks good and will resolve the issue of terraform version discrepancies as stated in the issue,