feat: let the runner build and the cluster pull from the Forgejo registry

- Runner egress: allow 192.168.1.160/32:443. forgejo.riotpiao.com resolves to
  the ingress LB, inside the 192.168.1.0/24 block the NetworkPolicy denies, so
  docker push hung until timeout.
- dind CA: also mount homelab-ca at /etc/docker/certs.d/forgejo.riotpiao.com/,
  the path dockerd actually reads for per-registry trust.
- Pull secret: dockerconfigjson for the api namespace; /v2/ answers 401.
- AppProject: allow the Forgejo repo as a source for api-gw.

k8s/infra/forgejo-runner/templates/networkpolicy.yaml

@@ -29,3 +29,13 @@ spec:
             except:
               - 192.168.1.0/24
               - 10.244.0.0/16
+    # Single LAN exception: the ingress-nginx LoadBalancer, which is how
+    # forgejo.riotpiao.com resolves. Image pushes go to that name so the tag
+    # matches what containerd pulls on the nodes; without this the whole /24 is
+    # denied above and `docker push` hangs until it times out.
+    - to:
+        - ipBlock:
+            cidr: {{ .Values.egress.ingressLoadBalancerIP }}/32
+      ports:
+        - protocol: TCP
+          port: 443