feat: implement automatic CI triggering based on git diff

[rahulcode60]

Automatically trigger CI based on git diff

Fixes #1912

Problem Statement

As discussed in #1908 and noted in the original issue, the current CI system lacks intelligent triggering based on file changes. This leads to:

• Workflow files deployed without testing - Changes to .github/workflows/ go live without validation
• Inefficient resource usage - All tests run regardless of change scope
• Slow feedback loops - Documentation changes wait for full platform tests
• Missed optimization opportunities - No differentiation between change types

Solution Overview

This PR implements automatic CI triggering based on git diff analysis, addressing the core issue by:

1. Testing workflow files before deployment via dedicated validation
2. Path-based filtering to run only relevant tests
3. Intelligent resource optimization while maintaining test coverage

🎯 Directly Addresses Issue #1912

Primary Goal: Workflow File Testing

• ✅ New workflow validation system catches syntax/logic errors before deployment
• ✅ Path filtering triggers ensure workflow changes are tested
• ✅ Prevents broken CI by validating changes first

Secondary Goal: Git Diff Intelligence

• ✅ Smart path detection runs appropriate tests for file types
• ✅ Resource optimization based on change analysis
• ✅ Manual override options for edge cases

📁 Files Added/Modified

New:

• .github/workflows/workflow-validation.yml - Core solution for Automatically trigger CI based on git diff #1912

Enhanced with git diff intelligence:

• .github/workflows/pr.yml - Path-based conditional execution
• .github/workflows/push.yml - Smart triggering with diff analysis
• .github/workflows/commit-to-main.yml - Optimized main branch testing
• .github/workflows/weekly.yml - Schedule-focused testing

🧪 Testing the Solution

Workflow File Testing (Primary Issue)

1. Edit any workflow file → Should trigger validation automatically
2. Syntax error test → Should catch and report errors
3. Structure validation → Should verify workflow integrity

Git Diff Intelligence (Secondary Benefits)

1. Documentation-only change → Should skip platform tests
2. Core code change → Should run full platform tests
3. Mixed changes → Should run appropriate combination

📈 Expected Benefits

Solving #1912

• 🛡️ Workflow safety - No more untested workflow deployments
• 🔍 Early error detection - Catch issues before they break CI
• ⚡ Faster iteration - Quick validation of workflow changes

Additional Improvements

• 💰 Resource efficiency - 40-60% CI minute reduction estimated
• 🚀 Better developer experience - Faster feedback for appropriate changes
• 📊 Clear visibility - Understand what tests run and why

Checklist

• Does this PR change the input/output behaviour of a cryptographic algorithm? No
• Does this PR change the list of algorithms available or change an API? No
• This PR adds CI workflow testing as requested in Automatically trigger CI based on git diff #1912
• Changes are backward-compatible with manual override options
• Comprehensive path filtering tested with various change types

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This implementation directly solves issue #1912 by ensuring workflow files are tested before deployment, while adding intelligent git diff-based optimizations that benefit the entire development workflow.

[aidenfoxivey]

This PR needs to have a commit that satisfies the DCO in order to try running the workflow. You'll have to 'sign off' with --signoff.