Simplify Helm workflow to build on main branch only

- Removed tag-based triggers and release creation
- Renamed workflow from helm-release.yml to helm-build.yml
- Simplified to always build and publish on main branch push
- Version always comes from Chart.yaml (no modifications)
- Removed all release-related logic and conditions
- Kept PR linting for validation
- Cleaner and simpler workflow focused on continuous delivery
- Updated README to reflect the new workflow structure

README.md

@@ -97,17 +97,16 @@ The CI/CD workflows automatically:
 3. Tags images with branch name
 4. Implements layer caching for faster builds
 
-**`.gitea/workflows/helm-release.yml`**:
+**`.gitea/workflows/helm-build.yml`**:
 1. Packages Helm charts on every main branch push
-2. Creates development versions for main branch builds
-3. Creates release versions for tags (v*.*.*)
-4. Publishes charts to Gitea Helm registry
-5. Creates GitHub releases for tagged versions
+2. Uses version from Chart.yaml (single source of truth)
+3. Publishes charts to Gitea Helm registry
+4. Validates charts on pull requests (lint only)
 
 **Triggers:**
 - Any branch push (Docker images)
 - Push to main branch (Helm chart)
-- Version tags (Helm releases)
+- Pull requests (Helm lint only)
 - Manual dispatch
 
 **Registry:** `git.commandware.com/demos/api7-demo`