build: Set up bazel to build the binaries and run test.

.gitignore

@@ -10,3 +10,7 @@ debian/patches
 /*.gcov
 /*.gcda
 /*.gcno
+/bazel-bin
+/bazel-cronutils
+/bazel-out
+/bazel-testlogs

BUILD

@@ -0,0 +1,57 @@
+cc_library(
+    name = "subprocess",
+    srcs = ["subprocess.c"],
+    hdrs = ["subprocess.h"],
+)
+
+cc_library(
+    name = "tempdir",
+    srcs = ["tempdir.c"],
+    hdrs = ["tempdir.h"],
+)
+
+cc_binary(
+    name = "runalarm",
+    srcs = ["runalarm.c"],
+    deps = [":subprocess"],
+)
+
+cc_binary(
+    name = "runlock",
+    srcs = ["runlock.c"],
+    deps = [
+        ":subprocess",
+        ":tempdir",
+    ],
+)
+
+cc_binary(
+    name = "runstat",
+    srcs = ["runstat.c"],
+    deps = [
+        ":subprocess",
+        ":tempdir",
+    ],
+)
+
+filegroup(
+    name = "tests",
+    srcs = glob(["tests/*.sh"]),
+)
+
+filegroup(
+    name = "goldens",
+    srcs = glob(["tests/*.out"]),
+)
+
+sh_test(
+    name = "regtest",
+    srcs = ["regtest.sh"],
+    data = [
+        ":goldens",
+        ":runalarm",
+        ":runlock",
+        ":runstat",
+        ":tests",
+    ],
+)

MODULE.bazel

@@ -0,0 +1,6 @@
+###############################################################################
+# Bazel now uses Bzlmod by default to manage external dependencies.
+# Please consider migrating your external dependencies from WORKSPACE to MODULE.bazel.
+#
+# For more details, please check https://github.com/bazelbuild/bazel/issues/18958
+###############################################################################