build: Add "zig build examples" command to build all examples

build.zig

@@ -10,6 +10,8 @@ pub fn build(b: *std.Build) void {
         .optimize = optimize,
     });
 
+    const examples_step = b.step("examples", "Build all examples");
+
     const exe = b.addExecutable(.{
         .name = "example",
         .root_module = b.createModule(.{
@@ -19,7 +21,8 @@ pub fn build(b: *std.Build) void {
         }),
     });
     exe.root_module.addImport("zigmulator", zigmulator);
-    b.installArtifact(exe);
+    const install_exe = b.addInstallArtifact(exe, .{});
+    examples_step.dependOn(&install_exe.step);
 
     const run_cmd = b.addRunArtifact(exe);
     if (b.args) |args| {
@@ -28,4 +31,16 @@ pub fn build(b: *std.Build) void {
 
     const run_step = b.step("run", "Run the example");
     run_step.dependOn(&run_cmd.step);
+
+    const open_file_exe = b.addExecutable(.{
+        .name = "open_file",
+        .root_module = b.createModule(.{
+            .root_source_file = b.path("examples/open_file.zig"),
+            .target = target,
+            .optimize = optimize,
+        }),
+    });
+    open_file_exe.root_module.addImport("zigmulator", zigmulator);
+    const install_open_file_exe = b.addInstallArtifact(open_file_exe, .{});
+    examples_step.dependOn(&install_open_file_exe.step);
 }