Make the the short git SHA available within the program

Author: karlseguin

.github/workflows/build.yml

@@ -28,7 +28,7 @@ jobs:
       - uses: ./.github/actions/install
 
       - name: zig build
-        run: zig build --release=safe -Doptimize=ReleaseSafe -Dengine=v8 -Dcpu=x86_64
+        run: zig build --release=safe -Doptimize=ReleaseSafe -Dengine=v8 -Dcpu=x86_64 -Dgit_commit=$(git rev-parse --short ${{ github.sha }})
 
       - name: Rename binary
         run: mv zig-out/bin/lightpanda lightpanda-${{ env.ARCH }}-${{ env.OS }}
@@ -60,7 +60,7 @@ jobs:
           arch: ${{env.ARCH}}
 
       - name: zig build
-        run: zig build --release=safe -Doptimize=ReleaseSafe -Dengine=v8
+        run: zig build --release=safe -Doptimize=ReleaseSafe -Dengine=v8 -Dgit_commit=$(git rev-parse --short ${{ github.sha }})
 
       - name: Rename binary
         run: mv zig-out/bin/lightpanda lightpanda-${{ env.ARCH }}-${{ env.OS }}

build.zig

@@ -58,6 +58,15 @@ pub fn build(b: *std.Build) !void {
         .optimize = mode,
     });
     try common(b, exe, options);
+    {
+        var opt = b.addOptions();
+        opt.addOption(
+            []const u8,
+            "git_commit",
+            b.option([]const u8, "git_commit", "Current git commit") orelse "dev",
+        );
+        exe.root_module.addImport("build_info", opt.createModule());
+    }
     b.installArtifact(exe);
 
     // run