ci: download zig binary directly instead of apt

.forgejo/workflows/release.yml

@@ -17,9 +17,15 @@ jobs:
       - name: Install tools
         run: |
           apt-get update
-          apt-get install -y dpkg-dev git curl openssh-client zig
+          apt-get install -y dpkg-dev git curl openssh-client xz-utils
           cargo install cargo-deb
 
+      - name: Install zig
+        run: |
+          curl -fsSL https://ziglang.org/download/0.13.0/zig-linux-x86_64-0.13.0.tar.xz | \
+            tar -xJ -C /usr/local --strip-components=1
+          zig version
+
       - name: Setup SSH
         run: |
           test -r /keys/forgejo_runner || { echo "Deploy key /keys/forgejo_runner chybi"; exit 1; }