Use specific SHA for base/head comparison and dump shas out to console (#589)

Author: DavidBoike

.github/workflows/auto-release.yml

@@ -26,7 +26,10 @@ jobs:
           # Script checks the diff of src/Particular.PlatformSample/Particular.PlatformSample.csproj in the just-merged PR, and invokes a release of the next minor if ServiceControl/ServicePulse changes
         
           # Get the diff of the component csproj file between the base and head of the just-merged PR
-          $diff = $(git diff ${{ github.event.pull_request.base.sha }} HEAD src/Particular.PlatformSample/Particular.PlatformSample.csproj )
+          $baseSha = "${{ github.event.pull_request.base.sha }}"
+          $headSha = "${{ github.event.pull_request.head.sha }}"
+          echo "Comparing diff of PR's base sha $baseSha with head sha $headSha to determine if ServiceControl/ServicePulse package was updated"
+          $diff = $(git diff $baseSha $headSha src/Particular.PlatformSample/Particular.PlatformSample.csproj )
           
           # Grep search for lines that show an addition contianing ServiceControl/ServicePulse
           $updates = $diff | grep -E '^\+\s+<PackageReference Include="Particular\.PlatformSample\.(ServiceControl|ServicePulse)"'