Workflows ask for the runner label that exists

One label per runner, spelled <os>-<arch>. The aliases these jobs named
were removed, and a job naming a label no runner carries waits instead of
failing.

Co-authored-by: Hanzo Dev <[email protected]>

.github/workflows/docker.yml

@@ -26,7 +26,7 @@ permissions:
 
 jobs:
   build:
-    runs-on: lux-build
+    runs-on: linux-amd64
     steps:
       - uses: actions/checkout@v4
 

.github/workflows/release-matrix.yml

@@ -20,7 +20,7 @@ jobs:
           - id: macos-arm64
             runner: luxfi-macos-arm64
           - id: linux-amd64
-            runner: luxfi-linux-amd64
+            runner: linux-amd64
           - id: linux-arm64
             runner: luxfi-linux-arm64
           - id: windows-amd64