Add ere-dockerized (#75)

scripts/sdk_installers/install_zisk_sdk.sh

@@ -77,6 +77,13 @@ else
 fi
 
 # Step 4: Make sure `lib-c`'s build script is ran.
+#
+# `ziskos` provides guest program runtime, and `lib-c` is a dependency of `ziskos`,
+# when we need to compile guest, the `build.rs` of `lib-c` will need to be ran once,
+# but if there are multiple `build.rs` running at the same time, it will panic.
+# So here we make sure it's already ran, and the built thing will be stored in
+# `$CARGO_HOME/git/checkouts/zisk-{hash}/{rev}/lib-c/c/build`, so could be
+# re-used as long as the `ziskos` has the same version.
 TEMP_DIR=$(mktemp -d)
 cd "$TEMP_DIR"
 cargo init . --name build-lib-c