Configure Gitea Actions for Helm chart CI and release

- Replace GitHub chart-releaser with Gitea-compatible workflow
- Lint job: helm lint, template validation on push to main/master
- Release job: package and publish to Gitea releases on tag push (v*)
- Use gitea-release-action for creating releases
- Support both main and master branches

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/verification-log.md

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+```
+Verifying FleetDM, MySQL, and Redis...
+
+=== Pods ===
+kubectl get pods -n fleetdm -o wide
+NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
+fleet-6747fdcc49-ljm2d 0/1 ContainerCreating 0 6m2s <none> fleetdm-control-plane <none> <none>
+fleet-migration-rwxnz 0/1 CreateContainerConfigError 0 6m2s 10.244.0.15 fleetdm-control-plane <none> <none>
+fleetdm-stack-mysql-0 0/1 ErrImagePull 0 6m2s 10.244.0.17 fleetdm-control-plane <none> <none>
+fleetdm-stack-redis-master-0 1/1 Running 0 6m2s 10.244.0.16 fleetdm-control-plane <none> <none>
+
+=== Services ===
+kubectl get svc -n fleetdm
+NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
+fleetdm-stack-mysql ClusterIP 10.96.140.26 <none> 3306/TCP 6m2s
+fleetdm-stack-mysql-headless ClusterIP None <none> 3306/TCP 6m2s
+fleetdm-stack-redis-headless ClusterIP None <none> 6379/TCP 6m2s
+fleetdm-stack-redis-master ClusterIP 10.96.248.50 <none> 6379/TCP 6m2s
+fleetdm-stack-service ClusterIP 10.96.24.191 <none> 8080/TCP 6m2s
+
+=== Ingress ===
+kubectl get ingress -n fleetdm
+NAME CLASS HOSTS ADDRESS PORTS AGE
+fleetdm-stack nginx fleet.localhost localhost 80 6m2s
+```