Document and codify the release process

The `wasmtime` release procees seems like it's been a bit ad-hoc up to
this point, so I figured it'd be good to try to document what we do
today and codify what should be done as well as a form of release
checklist.

I've noticed that we have a number of releases (like v0.11.0) but the
`Cargo.toml` files in the repository don't reflect the current version
of `wasmtime`. Additionally I've noticed that the [most recent release]
ended up having failed tests because `Cargo.toml` was modified but
`Cargo.lock` wasn't updated. I'm hoping that by having a checklist we
can avoid these sorts of accidental issues in the future!

[release]: https://github.com/bytecodealliance/wasmtime/runs/434690272

scripts/bump-wasmtime-version.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+set -euo pipefail
+
+# This is a convenience script for maintainers publishing a new version of
+# Wasmtime to crates.io. To use, bump the version number below, run the
+# script, and then run the commands that the script prints.
+
+topdir=$(dirname "$0")/..
+cd "$topdir"
+
+# All the wasmtime-* crates have the same version number
+version="0.10.0"
+
+# Update the version numbers of the crates to $version.
+echo "Updating crate versions to $version"
+find -name Cargo.toml \
+    -not -path ./crates/wasi-common/wig/WASI/tools/witx/Cargo.toml \
+    -exec sed -i.bk -e "s/^version = \"[[:digit:]].*/version = \"$version\"/" {} \;
+
+# Update the required version numbers of path dependencies.
+find -name Cargo.toml \
+    -not -path ./crates/wasi-common/wig/WASI/tools/witx/Cargo.toml \
+    -exec sed -i.bk \
+        -e "/\> *= *{.*\<path *= *\"/s/version = \"[^\"]*\"/version = \"$version\"/" \
+        {} \;
+
+cargo build

scripts/publish-all.sh

@@ -8,36 +8,10 @@ set -euo pipefail
 topdir=$(dirname "$0")/..
 cd "$topdir"
 
-# All the wasmtime-* crates have the same version number
-version="0.9.0"
-
-# Update the version numbers of the crates to $version.
-echo "Updating crate versions to $version"
-find -name Cargo.toml \
-    -not -path ./crates/wasi-common/WASI/tools/witx/Cargo.toml \
-    -exec sed -i.bk -e "s/^version = \"[[:digit:]].*/version = \"$version\"/" {} \;
-
-# Update the required version numbers of path dependencies.
-find -name Cargo.toml \
-    -not -path ./crates/wasi-common/wig/WASI/tools/witx/Cargo.toml \
-    -exec sed -i.bk \
-        -e "/\> *= *{.*\<path *= *\"/s/version = \"[^\"]*\"/version = \"$version\"/" \
-        {} \;
-
-# Update our local Cargo.lock (not checked in).
-cargo update
-scripts/test-all.sh
-
 # Commands needed to publish.
 #
 # Note that libraries need to be published in topological order.
 
-echo git checkout -b bump-version-to-$version
-echo git commit -a -m "\"Bump version to $version"\"
-echo git tag v$version
-echo git push origin bump-version-to-$version
-echo "# Don't forget to click the above link to open a pull-request!"
-echo git push origin v$version
 for cargo_toml in \
     crates/wasi-common/wasi-common-cbindgen/Cargo.toml \
     crates/wasi-common/winx/Cargo.toml \