Add self-hosted package publishing (#5)

## Motivation for the change, related issues

We need to deploy JS packages to a public-but-self-hosted location so
the Studio app can consume as dependencies. We expect this to continue
until we are again publishing releases to the NPM repo.

## Implementation details

Add a workflow for deploying self-hosted packages.

## Testing Instructions (or ideally a Blueprint)

We cannot test by manually running a new workflow until a version of the
workflow exists on the main branch. So we will have to commit this PR
without testing the workflow and follow up with a PR to fix the
workflow.

We can the next PR like this:
- Manually run the new workflow
- SSH into our package server and confirm the packages are deployed as
expected
- Create a local node package
- Add a dependency on one of the self-hosted packages that depends on
another (the `@wp-playground/cli` package URL should be good)
- `npm install`
- Confirm installation worked by testing `npx cli server`

Author: brandonpayton

.github/workflows/publish-self-hosted-package-release.yml

@@ -0,0 +1,78 @@
+name: Release self-hosted packages
+
+on:
+    workflow_dispatch:
+        # Require a version bump (patch, minor, major) and an optional dist tag
+        inputs:
+            should_bump_version:
+                type: boolean
+                description: 'Should bump version?'
+                required: true
+                default: true
+            version_bump:
+                description: 'Version bump (patch, minor, or major)'
+                required: true
+                default: 'patch'
+
+jobs:
+    release:
+        # Only run this workflow from the trunk branch and when it's triggered by a Playground maintainer
+        if: >
+            github.ref == 'refs/heads/trunk' && (
+                github.actor == 'adamziel' ||
+                github.actor == 'dmsnell' ||
+                github.actor == 'bgrgicak' ||
+                github.actor == 'brandonpayton' ||
+                github.actor == 'zaerl'
+            )
+
+        # Specify runner + deployment step
+        runs-on: ubuntu-latest
+        environment:
+            name: self-hosted-packages
+        steps:
+            - name: Install dependencies
+              run: apt-get install sshpass
+            - uses: actions/checkout@v4
+              with:
+                  ref: ${{ github.event.pull_request.head.ref }}
+                  clean: true
+                  persist-credentials: false
+                  submodules: true
+            - name: Config git user
+              run: |
+                  git config --global user.name "deployment_bot"
+                  git config --global user.email "[email protected]"
+                  git remote set-url origin https://${{ github.actor }}:${{ github.token }}@github.com/${{ github.repository }}
+            - uses: ./.github/actions/prepare-playground
+            # Version bump, release, tag a new version on GitHub
+            - name: Bump package versions
+              shell: bash
+              if: inputs.should_bump_version == true
+              run: npx [email protected] version ${{ inputs.version_bump || 'patch' }} --yes --no-private --loglevel=verbose
+            - name: Set hosting base URL
+              run: echo "HOSTING_BASE_URL='https://${{ vars.HOSTING_DOMAIN }}/${{ vars.HOSTING_SUBDIR }}'" >> $GITHUB_ENV
+            - name: Build JS packages for self-hosting
+              shell: bash
+              run: npx nx run-many --all --target=package-for-self-hosting -- --hostingBaseUrl="$HOSTING_BASE_URL'
+            - name: Set up deployment environment vars
+              run: |
+                  export LATEST_PACKAGE_VERSION=$(cat packages/php-wasm/universal/package.json | jq -r '.version')
+                  echo "LATEST_PACKAGE_VERSION=$LATEST_PACKAGE_VERSION" >> $GITHUB_ENV
+                  echo "PACKAGE_SOURCE_DIR=dist/packages-for-self-hosting/$(echo "$HOSTING_BASE_URL" | jq -r @uri)" >> $GITHUB_ENV
+                  echo 'PACKAGE_TARGET_DIR=/srv/htdocs/${{ vars.HOSTING_SUBDIR }}' >> $GITHUB_ENV
+            - name: Build source tarball
+              run: tools/scripts/package-source.sh "v$LATEST_PACKAGE_VERSION" "$PACKAGE_SOURCE_DIR/playground-sources-${LATEST_PACKAGE_VERSION}.tar.gz"
+            - name: Deploy self-hosted packages
+              env:
+                  SSH_PASSPHRASE: '${{ secrets.TARGET_SSH_PASSPHRASE }}'
+              run: |
+                  mkdir -p ~/.ssh
+                  echo "${{ secrets.TARGET_SSH_HOST_KEY }}" >> ~/.ssh/known_hosts
+                  chmod 0600 ~/.ssh/*
+                  sshpass -p "$TARGET_SSH_PASSPHRASE" ssh \
+                    ${{ secrets.TARGET_SSH_USER }}@${{ secrets.TARGET_SSH_HOST }} \
+                    -tt -C "mkdir -p '$PACKAGE_TARGET_DIR'"
+                  rsync -avz -e "sshpass -p "$TARGET_SSH_PASSPHRASE" ssh" --delete \
+                    "dist/packages-for-self-hosting/" \
+                    "${{ secrets.TARGET_SSH_USER }}@${{ secrets.TARGET_SSH_HOST }}:$PACKAGE_TARGET_DIR"