ci: automatically push to crates.io on release

.github/workflows/release.yml

@@ -0,0 +1,23 @@
+# This workflow publishes the `ibc` on crates.io when a semver tag is
+# pushed to main.
+name: Release
+
+on:
+  push:
+    tags:
+      - "v[0-9]+.[0-9]+.[0-9]+"             # Push events to matching v*, i.e. v0.26.0, v1.0.0
+      - "v[0-9]+.[0-9]+.[0-9]+-pre.[0-9]+"  # e.g. v0.26.0-pre.1
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+      - name: Publish crate
+        run: |
+          cd crates/ibc
+          cargo publish --token ${{ secrets.CRATES_TOKEN }}

CONTRIBUTING.md

@@ -254,19 +254,19 @@ Our release process is as follows:
 3. Bump all relevant versions in the `crates/ibc/Cargo.toml` file (making sure
       dependencies' versions are updated too) to the new version and push these
       changes to the release PR.
-
 4. In the `crates/ibc/` directory, run `cargo doc --all-features --open` locally to double-check that all the
    documentation compiles and seems up-to-date and coherent. Fix any potential
    issues here and push them to the release PR.
 5. In the `crates/ibc/` directory, run `cargo publish --dry-run` to double-check that publishing will work. Fix
    any potential issues here and push them to the release PR.
 6. Mark the PR as **Ready for Review** and incorporate feedback on the release.
 7. Once approved, merge the PR, and pull the `main` branch.
-8. From the `crates/ibc` folder, run `cargo publish`
-9. Once all crates have been successfully released, create a signed tag and push it to
+8. Once all crates have been successfully released, create a signed tag and push it to
    GitHub: `git tag -s -a vX.Y.Z`. In the tag message, write the version and the link
-   to the corresponding section of the changelog.
-10. Once the tag is pushed, create a GitHub release and append
-   `[📖CHANGELOG](https://github.com/cosmos/ibc-rs/blob/main/CHANGELOG.md#vXYZ)`
+   to the corresponding section of the changelog. Pushing the tag will trigger the [Release workflow](https://github.com/cosmos/ibc-rs/actions/workflows/release.yml),
+   which publishes the crate on crates.io.
+9. Once the tag is pushed, create a GitHub release and append
+   `[📖CHANGELOG](https://github.com/cosmos/ibc-rs/blob/main/CHANGELOG.md#vXYZ)` 
    to the release description.
+10. Make sure that the [Release workflow](https://github.com/cosmos/ibc-rs/actions/workflows/release.yml) to crates.io has completed successfully.
 11. All done! 🎉