add nanpa version management support

this adds support for versioning through
[nanpa](https://github.com/nbsp/nanpa), via the
[ilo](https://github.com/nbsp/ilo) GitHub bot.

usage guide:
1. on PRs, for each change, add a file to `.nanpa/<unique-name>.kdl`,
   that looks like this:

    patch type="added" package="livekit-ffi" "Add support for foo"

   alternatively you may add the file to `./livekit-ffi/.nanpa/`,
   and then drop the `package="livekit-ffi"`.

   `type`s follow [Keep a Changelog](https://keepachangelog.org).
2. ilo will create an issue when there's changes in the main branch.
   use the checkboxes to pick which ones you want to bump.
   additionally, if you want to set a prerelease version on a package:

    ilo prerelease rust-sdks/livekit-ffi alpha

   or to un-prerelease a package:

    ilo prerelease rust-sdks/livekit-ffi
3. close the issue, and the workflow should run, making a new commit
   and tagging it with all changed package versions.

note that when updating a package and its dependent, you need to either
bump them seperately, or manually update the dependency's Cargo.toml,
and then edit the dependent's manifest to include the new dep version.

repo settings that need to change:

- add [ilo](https://github.com/apps/ilo-nanpa) to the repository
- set the `NANPA_WORKFLOW` environmental variable to `publish.yml`,
  for CI (not as a secret!)

.github/workflows/publish.yml

@@ -12,30 +12,41 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-name: Publish crates
+name: Bump and publish crates
 
 on:
-  push:
-    tags:
-      - v*
+  workflow_dispatch:
+    inputs:
+      packages:
+        description: "packages to bump"
+        type: string
+        required: true
 
 env:
   CARGO_TERM_COLOR: always
   CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_TOKEN }}
 
 jobs:
+  bump:
+    permissions:
+      contents: write
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: nbsp/ilo@v1
+        with:
+          packages: ${{ github.event.inputs.packages }}
   publish:
-    runs-on: windows-latest
+    runs-on: ubuntu-latest
+    needs: bump
     steps:
       - uses: actions/checkout@v3
         with:
           submodules: true
       - name: Publish crates
         run: |
-          cd livekit-protocol && cargo publish --no-verify
-          cd ../webrtc-sys/build && cargo publish --no-verify
-          cd ../../webrtc-sys && cargo publish --no-verify
-          cd ../libwebrtc && cargo publish --no-verify
-          cd ../livekit-api && cargo publish --no-verify
-          cd ../livekit && cp ../README.md README.md && cargo publish --allow-dirty --no-verify
-          cd ../livekit-ffi && cargo publish --no-verify
+          git tag --points-at HEAD |
+          sed 's|^[^/]*@|@|' |
+          sed 's|^[^/]*/||' |
+          sed 's|@.*||' |
+          xargs -I _ sh -c 'cd ./_ && cargo publish --no-verify'

.nanparc

@@ -0,0 +1 @@
+packages livekit livekit-ffi livekit-protocol livekit-runtime livekit-api libwebrtc webrtc-sys webrtc-sys/build

libwebrtc/.nanparc

@@ -0,0 +1,2 @@
+version 0.3.7
+language rust

livekit-api/.nanparc

@@ -0,0 +1,2 @@
+version 0.4.0
+language rust

livekit-ffi/.nanparc

@@ -0,0 +1,2 @@
+version 0.10.2
+language rust

livekit-protocol/.nanparc

@@ -0,0 +1,2 @@
+version 0.3.5
+language rust

livekit-runtime/.nanparc

@@ -0,0 +1,2 @@
+version 0.3.0
+language rust

livekit/.nanparc

@@ -0,0 +1,2 @@
+version 0.6.0
+language rust

webrtc-sys/.nanparc

@@ -0,0 +1,2 @@
+version 0.3.5
+language rust

webrtc-sys/build/.nanparc

@@ -0,0 +1,2 @@
+version 0.3.5
+language rust