Add monthly automated Go version update workflow

[Copilot]

Implements automated monthly checks for new Go releases with PR creation for go.mod updates.

Implementation

• Schedule: Monthly cron on 1st at 9:00 UTC, manual trigger via workflow_dispatch
• Version detection: Uses actions/setup-go@v5 with go-version: stable to fetch latest release
• Comparison logic: Custom semantic version normalization supporting both major.minor and major.minor.patch formats
• Update mechanism: Modifies go.mod via sed, runs go mod tidy, creates PR with peter-evans/create-pull-request@v7

Version Normalization

Handles version format variations and validates numeric components:

normalize_version() {
  IFS='.' read -ra PARTS <<< "$1"
  local major="${PARTS[0]}" minor="${PARTS[1]}" patch="${PARTS[2]:-0}"
  
  # Validation: format and numeric checks
  [[ -z "$major" || -z "$minor" ]] && return 1
  [[ ! "$major" =~ ^[0-9]+$ ]] && return 1
  
  printf "%05d%05d%05d" "$major" "$minor" "$patch"
}

Comparison uses normalized strings to handle 1.21 ≡ 1.21.0 correctly while detecting actual version changes like 1.21.5 → 1.22.0.

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[madhanrm]

/azp run

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