feat: add support for devcontainers

[remyleone]

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Relates OR Closes #0000

Release note for CHANGELOG:

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.57%. Comparing base (fd3b665) to head (bcfe8c1).
⚠️ Report is 17 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5366      +/-   ##
==========================================
+ Coverage   55.53%   55.57%   +0.03%     
==========================================
  Files         320      322       +2     
  Lines       72408    72649     +241     
==========================================
+ Hits        40212    40372     +160     
- Misses      30702    30771      +69     
- Partials     1494     1506      +12     

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[Copilot]

Pull request overview

Adds Dev Container automation to keep the repository’s development container configuration up to date and continuously validated in CI.

Changes:

• Add a GitHub Actions workflow that builds/runs the devcontainer and executes go run ./cmd/scw --help.
• Enable Dependabot updates for the devcontainers ecosystem.
• Introduce .devcontainer configuration (Dockerfile + devcontainer.json) for local development and CI validation.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
.github/workflows/devcontainer.yml	New CI workflow to build and execute a command inside the devcontainer on PRs.
.github/dependabot.yml	Adds monthly Dependabot updates for devcontainer dependencies.
.devcontainer/devcontainer.json	Defines the devcontainer build, VS Code settings/extensions, env passthrough, and runtime args.
.devcontainer/Dockerfile	Minimal Dockerfile that selects the Go devcontainer base image via VARIANT.

Comments suppressed due to low confidence (1)

.devcontainer/devcontainer.json:11

• The comment describing valid Go VARIANT values is outdated (mentions 1.18/1.17 and buster/bullseye), but the config now uses dev-1.26-bookworm. Updating these comments to match the actual image/tag scheme used here will reduce confusion for future edits.

			// Update the VARIANT arg to pick a version of Go: 1, 1.18, 1.17
			// Append -bullseye or -buster to pin to an OS version.
			// Use -bullseye variants on local arm64/Apple Silicon.
			"VARIANT": "dev-1.26-bookworm",

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