fix(deploy): add APP_REPOS_ROOT env to git-hook deployment

Missing env var — git-hook worker needs APP_REPOS_ROOT to resolve repo
storage paths. Added explicit env block with APP_REPOS_ROOT=/data/repos,
consistent with gitserver deployment.

deploy/templates/git-hook-deployment.yaml

@@ -33,6 +33,9 @@ spec:
           envFrom:
             - configMapRef:
                 name: {{ include "gitdata.fullname" . }}-config
+          env:
+            - name: APP_REPOS_ROOT
+              value: /data/repos
             {{- range .Values.gitHook.env }}
             - name: {{ .name }}
               value: {{ .value | quote }}