no separate sdk fetch now we know they are all good hashes

.github/workflows/ci.yml

@@ -25,25 +25,9 @@ jobs:
       - id: set-matrix
         run: echo "matrix={\"sdk\":$(nix eval --json ".#sdks.x86_64-linux")}" | tee $GITHUB_OUTPUT
 
-  hl2sdk:
-    runs-on: ubuntu-latest
-    needs: sdk-matrix
-    strategy:
-      fail-fast: false
-      matrix: ${{fromJson(needs.sdk-matrix.outputs.matrix)}}
-    steps:
-      - uses: actions/checkout@v3
-      - uses: cachix/install-nix-action@v20
-      - uses: icewind1991/attic-action@v1
-        with:
-          name: ci
-          instance: https://cache.icewind.me
-          authToken: '${{ secrets.ATTIC_TOKEN }}'
-      - run: nix build .#hl2sdk.${{ matrix.sdk }}
-
   sourcemod:
     runs-on: ubuntu-latest
-    needs: [sdk-matrix, ambuild, hl2sdk]
+    needs: [sdk-matrix, ambuild]
     strategy:
       fail-fast: false
       matrix: ${{fromJson(needs.sdk-matrix.outputs.matrix)}}