Added release workflow (#1195)

* Added release workflow

* Addressed PR feedback
diff --git a/version.bzl b/version.bzl
new file mode 100644
index 0000000..0b27154
--- /dev/null
+++ b/version.bzl
@@ -0,0 +1,3 @@
+"""The version of rules_rust."""
+
+VERSION = "0.0.7"