chore(linux): Checkout source before building binary packages

Since we use an action that is defined in our source tree we have to
checkout the source before we can build the binary packages.

.github/workflows/deb-packaging.yml

@@ -119,6 +119,12 @@ jobs:
 
     runs-on: ubuntu-latest
     steps:
+    - name: Checkout
+      uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c #v3.3.0
+      with:
+        ref: '${{ github.event.client_payload.buildSha }}'
+        sparse-checkout: '.github/actions/'
+
     - name: Build
       uses: ./.github/actions/build-binary-packages
       with:
@@ -138,6 +144,12 @@ jobs:
 
     runs-on: ubuntu-latest
     steps:
+    - name: Checkout
+      uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c #v3.3.0
+      with:
+        ref: '${{ github.event.client_payload.buildSha }}'
+        sparse-checkout: '.github/actions/'
+
     - name: Build
       continue-on-error: true
       uses: ./.github/actions/build-binary-packages