GitHub workflows: echo info about what we're git diff'ing

Whenever A_D does a PR the checks, for some unclear reason, also contain
'other' files causing unexpected flake8 output.

i.e. PR that changes only plugins/inara.py somehow "git diff .. | flake8"
such that flake8 complains about things in collate.py, coriolis.py,
loadout.py

.github/workflows/pr-checks.yml

@@ -36,6 +36,8 @@ jobs:
         BASE_REPO_OWNER: ${{github.event.pull_request.base.repo.owner.login}}
 
       run: |
+        echo "BASE_REPO_URL: ${BASE_REPO_URL}"
+        echo "BASE_REPO_OWNER: ${BASE_REPO_OWNER}"
         # Add the 'base' repo as a new remote
         git remote add ${BASE_REPO_OWNER} ${BASE_REPO_URL}
         # And then fetch its references
@@ -70,6 +72,9 @@ jobs:
         BASE_REF: ${{github.base_ref}}
 
       run: |
+        echo "BASE_REPO_URL: ${BASE_REPO_URL}"
+        echo "BASE_REPO_OWNER: ${BASE_REPO_OWNER}"
+        echo "BASE_REF: ${BASE_REF}"
         # Explicitly check for some errors
         # E9 - Runtime (syntax and the like)
         # F63 - 'tests' checking

.github/workflows/push-checks.yml

@@ -39,6 +39,7 @@ jobs:
       run: |
         DATA=$(jq --raw-output .before $GITHUB_EVENT_PATH)
 
+        echo "DATA: ${DATA}"
         # stop the build if there are Python syntax errors or undefined names, ignore existing 
         git diff "$DATA" | flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics --diff
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide