ci: route to canonical native arcd labels [self-hosted, linux, <arch>]

Replaces non-canonical scale-set / org-prefixed labels with the
existing labels every arcd host registers with. Matches evo for
amd64 and spark for arm64. No new labels added.

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
         # cross-compiled (build only) in the `build` job below.
         arch: [amd64]
         cgo: ['0', '1']
-    runs-on: lux-build
+    runs-on: [self-hosted, linux, amd64]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
@@ -115,7 +115,7 @@ jobs:
 
   hqc-pqclean-e2e:
     name: HQC PQClean cgo e2e (NIST KAT roundtrip)
-    runs-on: lux-build
+    runs-on: [self-hosted, linux, amd64]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
@@ -167,7 +167,7 @@ jobs:
         arch: [amd64, arm64]
     # All builds run on the amd64 self-hosted runner. arm64 cross-compiles
     # via GOARCH; CGO_ENABLED=0 keeps it pure-Go (no cross-compiler needed).
-    runs-on: lux-build
+    runs-on: [self-hosted, linux, amd64]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5

.github/workflows/release.yml

@@ -19,7 +19,7 @@ jobs:
       # via cross-compile in the `build` job below.
       matrix:
         arch: [amd64]
-    runs-on: lux-build
+    runs-on: [self-hosted, linux, amd64]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
@@ -36,7 +36,7 @@ jobs:
         arch: [amd64, arm64]
     # All builds run on the amd64 self-hosted runner. arm64 cross-compiles
     # via GOARCH; CGO_ENABLED=0 keeps it pure-Go (no cross-compiler needed).
-    runs-on: lux-build
+    runs-on: [self-hosted, linux, amd64]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
@@ -51,7 +51,7 @@ jobs:
 
   release:
     needs: build
-    runs-on: lux-build
+    runs-on: [self-hosted, linux, amd64]
     steps:
       - uses: actions/checkout@v4
         with:

.github/workflows/test.yml

@@ -13,7 +13,7 @@ jobs:
       matrix:
         arch: [amd64]
         cgo: ['0', '1']
-    runs-on: lux-build
+    runs-on: [self-hosted, linux, amd64]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
@@ -63,7 +63,7 @@ jobs:
   # Slower than native (5-10x) but functional for arm64 regression catching.
   go-arm64-emulated:
     if: github.event_name == 'push' && github.ref == 'refs/heads/main'
-    runs-on: lux-build
+    runs-on: [self-hosted, linux, amd64]
     steps:
       - uses: actions/checkout@v4
       - name: Set up QEMU
@@ -87,7 +87,7 @@ jobs:
       # Same constraint: cargo must execute on the build host's arch.
       matrix:
         arch: [amd64]
-    runs-on: lux-build
+    runs-on: [self-hosted, linux, amd64]
     defaults:
       run:
         working-directory: rust