feat: add dotenv action to load environment variables

[creativeprojects]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.99%. Comparing base (d37d8e7) to head (0a4acaf).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #632   +/-   ##
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  Coverage   80.99%   80.99%           
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  Files         162      162           
  Lines       12113    12113           
=======================================
  Hits         9810     9810           
  Misses       1806     1806           
  Partials      497      497           

Flag	Coverage Δ
unittests	79.26% <ø> (ø)

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[Copilot]

Pull request overview

This PR restructures the GitHub Actions CI setup by splitting platform-specific workflows and centralizing shared tool versions via a dotenv-loaded env file.

Changes:

• Replace the previous combined Build/BSD workflows with per-OS workflows and reusable run-tests-* workflows.
• Introduce a shared .github/workflows/env file loaded via falti/dotenv-action@v1 to supply Go and golangci-lint versions.
• Update README badges to reflect the new workflow layout.

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
README.md	Updates CI badges to point to the new per-OS workflows.
.github/workflows/ubuntu.yml	Adds Linux workflow that delegates to reusable run-tests-os.yml.
.github/workflows/macos.yml	Adds macOS workflow that delegates to reusable run-tests-os.yml.
.github/workflows/windows.yml	Adds Windows workflow that delegates to reusable run-tests-os.yml.
.github/workflows/ssh.yml	Adds dedicated SSH client test workflow and loads shared tool versions via dotenv.
.github/workflows/run-tests-os.yml	Introduces reusable workflow for building/linting/testing on host OS runners.
.github/workflows/run-tests-vm.yml	Introduces reusable workflow for building tests and running them inside QEMU VMs.
.github/workflows/freebsd.yml	Adds FreeBSD VM workflow that delegates to run-tests-vm.yml.
.github/workflows/netbsd.yml	Adds NetBSD VM workflow that delegates to run-tests-vm.yml.
.github/workflows/openbsd.yml	Adds OpenBSD VM workflow that delegates to run-tests-vm.yml.
.github/workflows/env	Adds centralized Go/lint version definitions consumed by workflows via dotenv-action outputs.
.github/workflows/doc.yml	Updates docs build workflow to load Go version from dotenv env file.
.github/workflows/release-doc.yml	Updates docs release workflow to load Go version from dotenv env file.
.github/workflows/release.yml	Updates release workflow to load Go version from dotenv env file and renames workflow.
.github/workflows/snapshot.yml	Updates snapshot workflow to load Go version from dotenv env file.
.github/workflows/docker.yml	Updates docker rebuild workflow to load Go version from dotenv env file and sets job name.
.github/workflows/codeql.yml	Updates CodeQL workflow to load Go version from dotenv env file.
.github/workflows/build.yml	Removes old combined build/test workflow (replaced by per-OS + reusable workflows).
.github/workflows/BSD-tests.yml	Removes old combined BSD VM workflow (replaced by per-BSD + reusable VM workflow).

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