workflows/openshift-os : fixing up the initial checkout

the base branch should be checked out initally otherwise the rebase will
fails.
Also fixup the log generation to remove the hard-coded testing-devel

.github/workflows/openshift-os.yml

@@ -38,6 +38,8 @@ jobs:
           # We need an unbroken commit chain when pushing to the fork.  Don't
           # make assumptions about which commits are already available there.
           fetch-depth: 0
+          # We need to checkout against the target branch
+          ref: ${{ github.event.inputs.target-branch }}
 
       - name: Update submodule
         env:
@@ -58,7 +60,7 @@ jobs:
           cd fedora-coreos-config
           # Omit CoreOS Bot commits from the log message, since they generally
           # only affect FCOS
-          git shortlog "HEAD..testing-devel" --perl-regexp \
+          git shortlog "HEAD..origin/$SOURCE_BRANCH" --perl-regexp \
               --author='^((?!CoreOS Bot <[email protected]>).*)$' \
               > $RUNNER_TEMP/shortlog
 
@@ -67,7 +69,7 @@ jobs:
               echo "No non-trivial changes; exiting"
               exit 0
           fi
-          git checkout $SOURCE_BRANCH
+
 
           marker=OPENSHIFT-OS-END-OF-LOG-MARKER-$RANDOM$RANDOM$RANDOM
           cat >> $GITHUB_ENV <<EOF
@@ -77,10 +79,10 @@ jobs:
           EOF
 
       - name: Open pull request
-        uses: peter-evans/create-pull-request@v4.2.3
+        uses: peter-evans/create-pull-request@v6.0.0
         with:
           token: ${{ secrets.COREOSBOT_RELENG_TOKEN }}
-          push-to-fork: coreosbot-releng/os
+          push-to-fork: openshift/os
           branch: ${{ env.BRANCH_NAME }}
           base: ${{ env.TARGET_BRANCH }}
           commit-message: |