Adds ENVOY_VERSION (#5)

Author: mathetake

ENVOY_VERSION

@@ -0,0 +1 @@
+80c1ac2143a7a73932c9dff814d38fd6867fe691

README.md

@@ -56,6 +56,17 @@ curl localhost:1062/uuid
 
 to make sure the (passthrough) filter is working.
 
-[78efd97]: https://github.com/envoyproxy/envoy/tree/80c1ac2143a7a73932c9dff814d38fd6867fe691
+
+## Update Envoy Version
+
+To update the Envoy version used in this repository, execute the following command:
+
+```
+CURRENT_VERSION="$(cat ENVOY_VERSION)"
+NEW_VERSION=80c1ac2143a7a73932c9dff814d38fd6867fe691 # Whatever the head commit in envoyproxy/envoy repo.
+grep -rlF "${CURRENT_VERSION}" . | xargs sed -i "s/${CURRENT_VERSION}/${NEW_VERSION}/g"
+```
+
+[80c1ac2143a7a73932c9dff814d38fd6867fe691]: https://github.com/envoyproxy/envoy/tree/80c1ac2143a7a73932c9dff814d38fd6867fe691
 [Envoy]: https://github.com/envoyproxy/envoy
 [High Level Doc]: https://www.envoyproxy.io/docs/envoy/latest/intro/arch_overview/advanced/dynamic_modules

rust/Cargo.lock

@@ -8,7 +8,7 @@ repository = "https://github.com/envoyproxy/dynamic-modules-example"
 
 [dependencies]
 # The SDK version must match the Envoy version due to the strict compatibility requirements.
-envoy-proxy-dynamic-modules-rust-sdk = { git = "https://github.com/envoyproxy/envoy", rev = "78efd97" }
+envoy-proxy-dynamic-modules-rust-sdk = { git = "https://github.com/envoyproxy/envoy", rev = "80c1ac2143a7a73932c9dff814d38fd6867fe691" }
 
 [lib]
 name = "rust_module"