sync_release-manifest: remove top-level backstage directory

The top-level backstage/ directory included in
this repo means we can't use the yarn-install
backstage action (or we'd have to add a `path`
input option to it).

Looking at this workflow, I can't actually spot
why the top-level `backstage` dir is needed -
nothing is ever written outside it as far as I can
spot. With that in mind, proposing we remove it to
simplify the workflow and enable the use of the
`yarn-install` action without needing to extend it.

Signed-off-by: MT Lewis <mtlewis@users.noreply.github.com>

.github/workflows/sync_release-manifest.yml

@@ -15,7 +15,6 @@ jobs:
       - name: Checkout
         uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
         with:
-          path: backstage
           # 'v' prefix is added here for the tag, we keep it out of the manifest logic
           ref: v${{ github.event.client_payload.version }}
 
@@ -28,11 +27,10 @@ jobs:
       - name: yarn install
         uses: backstage/actions/yarn-install@a674369920067381b450d398b27df7039b7ef635 # v0.6.5
         with:
-          path: backstage
           cache-prefix: ${{ runner.os }}-v18.x
 
       - name: Build yarn plugin
-        working-directory: backstage/packages/yarn-plugin
+        working-directory: packages/yarn-plugin
         run: yarn build
 
       # Checkout backstage/versions into /backstage/versions, which is where store the output
@@ -40,7 +38,7 @@ jobs:
         uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
         with:
           repository: backstage/versions
-          path: backstage/versions
+          path: versions
           token: ${{ secrets.GH_SERVICE_ACCOUNT_TOKEN }}
 
       - name: Configure Git
@@ -51,7 +49,6 @@ jobs:
       - name: Create release
         # This grabs the scripts from master in order to support backfills
         run: |
-          cd backstage
           mkdir -p scripts
           wget -O scripts/assemble-manifest.js https://raw.githubusercontent.com/backstage/backstage/master/scripts/assemble-manifest.js
           node scripts/assemble-manifest.js ${{ github.event.client_payload.version }}
@@ -60,16 +57,15 @@ jobs:
       # directory, allowing the plugin to be installed with a command like
       # `yarn plugin import https://versions.backstage.io/v1/tags/main/yarn-plugin`
       - name: Add yarn plugin to release
-        working-directory: backstage/packages/yarn-plugin
+        working-directory: packages/yarn-plugin
         run: >-
           cp
           bundles/@yarnpkg/plugin-backstage.js
           ../../versions/v1/releases/${{ github.event.client_payload.version }}/yarn-plugin
 
       - name: Commit to versions repo
-        working-directory: backstage/versions
+        working-directory: versions
         run: |
-          cd versions
           git add .
           git commit -am "${{ github.event.client_payload.version }}"
           git push
@@ -87,7 +83,7 @@ jobs:
               workflow_id: 'release.yml',
               ref: 'master',
               inputs: {
-                version: require('./backstage/packages/create-app/package.json').version,
-                releaseVersion: require('./backstage/package.json').version
+                version: require('./packages/create-app/package.json').version,
+                releaseVersion: require('./package.json').version
               },
             });