Try job context instead

Co-authored-by: Florian Sesser <florian@leastauthority.com>
Signed-off-by: Benoit Donneaux <benoit@leastauthority.com>

Author: btlogy

.github/workflows/nix.yml

@@ -14,13 +14,6 @@ on:
       - 'nix/**'
       - 'flake.*'
 
-env:
-  # This define the targeted systems we want to check (and later deploy) the nixosConfiguration
-  MATRIX: |
-    matrix={"include":[
-      {"target":"webforge","hostname":"webforge","domain":"tahoe-lafs.org"}
-    ]}
-
 jobs:
   check:
     name: Check
@@ -39,6 +32,12 @@ jobs:
         run: |
           nix flake show
           nix flake check
+    env:
+      # This define the targeted systems we want to check (and later deploy) the nixosConfiguration
+      MATRIX: |
+        matrix={"include":[
+          {"target":"webforge","hostname":"webforge","domain":"tahoe-lafs.org"}
+        ]}
 
   build:
     name: Build
@@ -47,7 +46,7 @@ jobs:
     needs: check
     strategy:
       fail-fast: false
-      matrix: ${{fromJson(env.MATRIX)}}
+      matrix: ${{fromJson(needs.check.env.MATRIX)}}
     steps:
       - name: Checkout
         id: checkout