Prepare release 2.2.0 (#609)

- **update version numbers**
- **update cargo.toml files to reference the risc0 release branch**
- **check in lock files**
- **update Steel changelog**
- **update .gitignore**
- **update Steel README**
- **remove notice in header**

Author: nategraf

.github/workflows/e2e.yml

@@ -19,7 +19,7 @@ env:
   GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
   RISC0_TOOLCHAIN_VERSION: 1.85.0
   FOUNDRY_VERSION: v1.2.2
-  RISC0_MONOREPO_REF: "main"
+  RISC0_MONOREPO_REF: "release-2.1"
 
 jobs:
   e2e-tests:

.github/workflows/main.yml

@@ -18,7 +18,7 @@ env:
   GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
   RISC0_TOOLCHAIN_VERSION: 1.85.0
   FOUNDRY_VERSION: v1.2.2
-  RISC0_MONOREPO_REF: "main"
+  RISC0_MONOREPO_REF: "release-2.1"
   # CARGO_LOCKED is defined as the string '--locked' in PRs targeting release branches and '' elsewhere.
   CARGO_LOCKED: ${{ (startsWith(github.base_ref, 'release-') || startsWith(github.base_ref, 'refs/heads/release-')) && '--locked' || '' }}
 

.github/workflows/steel-documentation.yml

@@ -18,7 +18,7 @@ concurrency:
 
 env:
   RISC0_TOOLCHAIN_VERSION: 1.85.0
-  RISC0_MONOREPO_REF: "main"
+  RISC0_MONOREPO_REF: "release-2.1"
 
 jobs:
   build:

.gitignore

@@ -26,8 +26,3 @@ out/
 
 # Ignore the file with RPC and Etherscan API keys for deployment.
 deployment_secrets.toml
-
-# We ignore lock files in this repository on main because we want to
-# continually track and develop against risc0 main. When lock files are
-# tracked, CI will pin to a commit and only rarely update.
-Cargo.lock