Enable Nix and refresh linux cache volumes

services/forgejo-nsc/README.md

@@ -48,7 +48,8 @@ profile. The important knobs are:
 - `namespace.linux_cache_*` / `namespace.macos_cache_*` – persistent cache
   volumes mounted into runners so Linux can keep `/nix` plus shared build
   caches warm and macOS can reuse Rust toolchains, Xcode package caches, and
-  lane-local derived data.
+  lane-local derived data. If Namespace keeps reusing an older undersized cache
+  volume, bump the cache tag name to force a fresh allocation at the new size.
 
 ### Running locally
 

services/forgejo-nsc/config.example.yaml

@@ -23,12 +23,12 @@ namespace:
   network: ""
   linux_cache_path: "/var/cache/burrow"
   linux_cache_volumes:
-    - tag: "burrow-forgejo-linux-nix"
+    - tag: "burrow-forgejo-linux-nix-v2"
       mount_point: "/nix"
-      size_gb: 60
+      size_gb: 80
-    - tag: "burrow-forgejo-linux-cache"
+    - tag: "burrow-forgejo-linux-cache-v2"
       mount_point: "/var/cache/burrow"
-      size_gb: 40
+      size_gb: 80
   macos_cache_path: "/Users/runner/.cache/burrow"
   macos_cache_volumes:
     - tag: "burrow-forgejo-macos-shared-v1"

services/forgejo-nsc/deploy/dispatcher.yaml

@@ -33,12 +33,12 @@ namespace:
   network: ""
   linux_cache_path: "/var/cache/burrow"
   linux_cache_volumes:
-    - tag: "burrow-forgejo-linux-nix"
+    - tag: "burrow-forgejo-linux-nix-v2"
       mount_point: "/nix"
-      size_gb: 60
+      size_gb: 80
-    - tag: "burrow-forgejo-linux-cache"
+    - tag: "burrow-forgejo-linux-cache-v2"
       mount_point: "/var/cache/burrow"
-      size_gb: 40
+      size_gb: 80
   macos_cache_path: "/Users/runner/.cache/burrow"
   macos_cache_volumes:
     - tag: "burrow-forgejo-macos-shared-v1"

services/forgejo-nsc/internal/config/config.go

@@ -176,14 +176,14 @@ func (c *Config) Validate() error {
 	if len(c.Namespace.LinuxCacheVolumes) == 0 {
 		c.Namespace.LinuxCacheVolumes = []CacheVolumeConfig{
 			{
-				Tag:        "burrow-forgejo-linux-nix",
+				Tag:        "burrow-forgejo-linux-nix-v2",
 				MountPoint: "/nix",
-				SizeGb:     60,
+				SizeGb:     80,
 			},
 			{
-				Tag:        "burrow-forgejo-linux-cache",
+				Tag:        "burrow-forgejo-linux-cache-v2",
 				MountPoint: c.Namespace.LinuxCachePath,
-				SizeGb:     40,
+				SizeGb:     80,
 			},
 		}
 	}

services/forgejo-nsc/internal/nsc/dispatcher.go

@@ -410,6 +410,8 @@ func appendVolumeArgs(args []string, volumes []CacheVolume) []string {
 func (d *Dispatcher) bootstrapScript() string {
 	var builder strings.Builder
 	builder.WriteString(`set -euo pipefail
+export HOME=/root
+export USER=root
 mkdir -p "${FORGEJO_RUNNER_WORKDIR:-/tmp/forgejo-runner}"
 cd "${FORGEJO_RUNNER_WORKDIR:-/tmp/forgejo-runner}"
 
@@ -437,6 +439,9 @@ if [ -f /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh ]; then
   # shellcheck disable=SC1091
   . /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
 fi
+export PATH="/nix/var/nix/profiles/default/bin:/nix/var/nix/profiles/default/sbin:${PATH}"
+export NIX_CONFIG="experimental-features = nix-command flakes
+accept-flake-config = true"
 node --version >/dev/null
 nix --version >/dev/null