feat: complete Gitea Actions CI workflow for container builds

- Fix trigger/env path: Helm/ -> helm/ (was wrong case)
- Add image_yq_path and dockerfile to matrix so each container uses its
  own values.yaml key and Dockerfile path
- Fix yq paths: .django.image.* -> .frontend.image/.backend.image for
  repo, .containers.version for tag (single source of truth)
- Add file: param to docker/build-push-action (Dockerfiles are in
  frontend/ and backend/, not repo root)
- values.yaml: add registry prefix to image fields so k8s pulls from
  git.baumann.gr; quote containers.version; drop per-component tag
  fields (containers.version is now the single tag source)
- Deployment templates: use .containers.version for image tag

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

helm/shorefront/templates/backend-deployment.yaml

@@ -18,7 +18,7 @@ spec:
     spec:
       initContainers:
         - name: migrate
-          image: "{{ .Values.backend.image }}:{{ .Values.backend.tag }}"
+          image: "{{ .Values.backend.image }}:{{ .Values.containers.version }}"
           command: ["alembic", "upgrade", "head"]
           env:
             - name: POSTGRES_PASSWORD
@@ -30,7 +30,7 @@ spec:
               value: "postgresql://{{ .Values.postgres.user }}:$(POSTGRES_PASSWORD)@postgres:5432/{{ .Values.postgres.database }}"
       containers:
         - name: backend
-          image: "{{ .Values.backend.image }}:{{ .Values.backend.tag }}"
+          image: "{{ .Values.backend.image }}:{{ .Values.containers.version }}"
           command: ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]
           env:
             - name: POSTGRES_PASSWORD

helm/shorefront/templates/frontend-deployment.yaml

@@ -18,7 +18,7 @@ spec:
     spec:
       containers:
         - name: frontend
-          image: "{{ .Values.frontend.image }}:{{ .Values.frontend.tag }}"
+          image: "{{ .Values.frontend.image }}:{{ .Values.containers.version }}"
           ports:
             - containerPort: 80
           resources:

helm/shorefront/values.yaml

@@ -1,16 +1,14 @@
 namespace: shorefront
 
 backend:
-  image: shorefront-backend
-  tag: latest
+  image: git.baumann.gr/adebaumann/shorefront-backend
   replicas: 1
   resources:
     requests: { cpu: 100m, memory: 128Mi }
     limits: { cpu: 500m, memory: 512Mi }
 
 frontend:
-  image: shorefront-frontend
-  tag: latest
+  image: git.baumann.gr/adebaumann/shorefront-frontend
   replicas: 1
   resources:
     requests: { cpu: 50m, memory: 64Mi }
@@ -33,3 +31,6 @@ nfs:
 ingress:
   host: shorefront.example.com
   ingressClassName: traefik
+
+containers:
+  version: "0.001"