ci: remove container usage and download v8 from release

.github/workflows/build.yml

@@ -1,8 +1,5 @@
 name: nightly build
 
-env:
-  ARCH: x86_64-linux
-
 on:
   schedule:
     - cron: "2 2 * * *"
@@ -12,26 +9,14 @@ on:
 
 permissions:
   contents: write
-  packages: read
 
 jobs:
-  build:
-    name: nightly build
+  build-linux-x86_64:
+    env:
+      ARCH: x86_64
+      OS: linux
 
-    strategy:
-      matrix:
-        target:
-          - x86_64-linux
-        include:
-          - target: x86_64-linux
-            os: ubuntu-latest
-
-    runs-on: ${{ matrix.os }}
-    container:
-      image: ghcr.io/lightpanda-io/zig-browsercore:0.12.1
-      credentials:
-       username: ${{ github.actor }}
-       password: ${{ secrets.GITHUB_TOKEN }}
+    runs-on: ubuntu-latest
 
     steps:
       - uses: actions/checkout@v4
@@ -47,11 +32,11 @@ jobs:
         run: zig build --release=safe -Doptimize=ReleaseSafe -Dengine=v8
 
       - name: Rename binary
-        run: mv zig-out/bin/browsercore-get lightpanda-get-${{ matrix.target }}
+        run: mv zig-out/bin/browsercore-get lightpanda-get-${{ env.ARCH }}-${{ env.OS }}
 
       - name: Upload the build
         uses: ncipollo/release-action@v1
         with:
           allowUpdates: true
-          artifacts: lightpanda-get-${{ matrix.target }}
+          artifacts: lightpanda-get-${{ env.ARCH }}-${{ env.OS }}
           tag: nightly