Updated CSP settings in Traefik configuration for beta, dev, staging,
and test environments to include Sentry's domain without the ingest
subdomain. This change permits Sentry error logging and reporting to
function correctly without being blocked by the CSP. The adjustment
ensures Sentry can capture and report runtime errors, facilitating
better monitoring and debugging capabilities across our development,
testing, and staging phases.

- Modified CSP `connect-src` directive to set
  `o4506155985141760.ingest.sentry.io` replacing old Sentry
  sources.
- Ensured that the updated settings adhere to our security policies by
  only allowing necessary and trusted sources.

This update addresses the need for comprehensive error reporting through
Sentry, enhancing our ability to quickly identify and resolve issues in
our application's environments.

- Integrated OAuth for secure Slack deployment notifications #194.
- Streamlined build and deployment process for faster CD and reduced
  resource use #246.
- Allow Sentry error reporting in CSP settings across environments #291.

This commit introduces a significant update to the `.env.example` file
within the `scripts/govtool` directory to enhance usability and prevent
configuration mistakes. Key changes include:

- Addition of Vim modeline at the beginning of the file (`# vim: set
  ft=bash`) to ensure that when editing the file with Vim, the correct
  filetype (bash) is automatically set. This facilitates syntax
  highlighting and other filetype-specific features, improving the editing
  experience.
- Introduction of a conditional warning mechanism that activates when
  the environment is not set to 'dev'. This mechanism employs bash
  scripting to alert to users, especially those working in
  non-development environments, to proceed with caution and be aware of
  their current configuration context. The warning message explicitly
  states the current environment value, reinforcing the need for
  attentiveness.

These enhancements are designed to minimize the risk of misconfiguration
by providing clear, environment-specific warnings and improving file
readability and editing support.