ci: replace master with main

[k-yang]

Description

Substitute references from master branch to main branch.

Purpose

Summary by CodeRabbit

• Chores

  • Updated GitHub Actions workflows to reference the new default branch name "main" instead of "master."

• Documentation

  • Updated all workflow files to reflect the industry-wide shift in naming conventions for the default branch.

[coderabbitai]

Walkthrough

The changes across various GitHub Actions workflow files reflect a shift from using 'master' to 'main' as the default branch name. This update affects triggers for workflows and conditions for canceling in-progress jobs, ensuring that the workflows are aligned with the new naming convention.

Changes

File Path	Change Summary
.github/workflows/docker-publish.yml .github/workflows/golangci-lint.yml .github/workflows/pr-title-lint.yml	Updated default branch from "master" to "main".
.github/workflows/e2e-wasm.yml .github/workflows/integration-tests.yml .github/workflows/proto-lint.yml .github/workflows/unit-tests.yml	Changed cancel-in-progress condition to check for 'refs/heads/main' instead of 'refs/heads/master'.

🐇✨
In the land of code and git,
'main' is now the name that's fit.
Goodbye 'master', old and plain,
Hello 'main', we've made the switch, hooray! 🎉
✨🐇

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[Unique-Divine]

Note that some of the parts that say main still need to be master if they refer to a branch of an imported workflow