feat: add multi-repo cloning, remove dynamic/serverless mode

Add githubRepos list field for cloning multiple repositories into a
single dev container with multi-root workspace file generation.
Remove the unused dynamic deployment mode (Knative, routing proxy,
serverless scripts) to simplify the chart to persistent-only.
Fix release workflow cache-to setting that violated the no-cache policy.

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

chart/values.yaml

@@ -5,20 +5,22 @@
 # Instance name — used to generate resource names (devcontainer-{name}, userhome-{name})
 name: ""
 
-# Deployment mode controls the infrastructure pattern
-# - persistent: Traditional model with PVC storage, single long-lived deployment
-# - dynamic: Serverless model with Knative, auto-scaling from 0, dynamic GitHub routing
-deploymentMode: persistent  # persistent | dynamic
-
 # Container image configuration
 image:
   repository: ghcr.io/cpfarhood/devcontainer
   tag: latest
   pullPolicy: Always
 
-# GitHub repository to clone into /workspace (ignored in dynamic mode - uses URL routing)
+# GitHub repository to clone into /workspace
 githubRepo: ""
 
+# Multiple GitHub repositories to clone into /workspace (takes precedence over githubRepo)
+# Example:
+#   githubRepos:
+#     - https://github.com/user/repo1
+#     - https://github.com/user/repo2
+githubRepos: []
+
 # =============================================================================
 # ACCESS & INTERFACE
 # =============================================================================
@@ -192,67 +194,6 @@ autoDetect:
 # Override specific values above to customize
 resourceProfile: auto    # auto | small | medium | large | xlarge
 
-# =============================================================================
-# DYNAMIC MODE CONFIGURATION (deploymentMode: dynamic)
-# =============================================================================
-
-# Dynamic mode uses Knative Services and routing proxy for serverless operation
-dynamic:
-  # Knative Service configuration
-  knative:
-    # Scaling configuration
-    minScale: 0                    # Scale to zero when not in use
-    maxScale: 10                   # Maximum number of concurrent instances
-    target: 1                      # Requests per instance (isolation = 1 request per pod)
-    scaleToZeroGracePeriod: "5m"   # Keep instances warm for 5 minutes
-
-    # Container startup timeout (repo cloning + IDE startup)
-    timeoutSeconds: 600            # 10 minutes
-
-    # Resource configuration (per instance)
-    resources:
-      requests:
-        memory: "1Gi"
-        cpu: "500m"
-      limits:
-        memory: "4Gi"
-        cpu: "2000m"
-
-  # Routing proxy configuration (extracts GitHub repo from URL)
-  routingProxy:
-    enabled: true
-    replicas: 2                    # High availability
-    image:
-      repository: ghcr.io/cpfarhood/devcontainer-routing-proxy
-      tag: latest
-      pullPolicy: Always
-
-    resources:
-      requests:
-        memory: "64Mi"
-        cpu: "100m"
-      limits:
-        memory: "256Mi"
-        cpu: "500m"
-
-  # Ingress configuration for dynamic mode
-  ingress:
-    enabled: true
-    className: nginx
-    host: ""                       # Set this to your domain (e.g., devcontainer.farh.net)
-
-    # TLS configuration
-    tls:
-      enabled: true
-      secretName: ""               # Auto-generated if empty
-      issuer: "letsencrypt-prod"   # cert-manager ClusterIssuer
-
-    # Authentik forward auth configuration
-    authentik:
-      enabled: false               # Set to true when Authentik is configured
-      authUrl: "http://authentik.authentik.svc.cluster.local/outpost.goauthentik.io/auth/nginx"
-      signIn: "https://auth.example.com/outpost.goauthentik.io/start?rd=$escaped_request_uri"
-
 # =============================================================================
 # ADVANCED CONFIGURATION
 # =============================================================================