Fixup workflow syntax for update-* workflows

Author: HoloRin

.github/workflows/update-otp-for-oci.yaml

@@ -22,10 +22,11 @@ jobs:
     - name: SKIP IF THE PR ALREADY EXISTS
       id: check-for-branch
       run: |
-        c=$(git ls-remote --exit-code --heads origin bump-otp-for-oci)
-        echo "::set-output name=c::$c"
+        set +e
+        git ls-remote --exit-code --heads origin bump-otp-for-oci
+        echo "::set-output name=c::$?"
     - name: DETERMINE LATEST PATCH & SHA
-      if: steps.check-for-branch.c != 0
+      if: steps.check-for-branch.outputs.c != 0
       id: fetch-version
       run: |
         TAG_NAME=$(curl -s GET https://api.github.com/repos/erlang/otp/tags \
@@ -37,7 +38,7 @@ jobs:
         echo "::set-output name=VERSION::${TAG_NAME#OTP-}"
         echo "::set-output name=SHA::${SHA}"
     - name: MODIFY VERSION FILE
-      if: steps.check-for-branch.c != 0
+      if: steps.check-for-branch.outputs.c != 0
       run: |
         echo "Updating packaging/docker-image/${{ matrix.image_tag_suffix }}.yaml with:"
         echo "  otp -> ${{ steps.fetch-version.outputs.VERSION }}"
@@ -50,7 +51,7 @@ jobs:
         set -x
         git diff
     - name: CREATE PULL REQUEST
-      if: steps.check-for-branch.c != 0
+      if: steps.check-for-branch.outputs.c != 0
       uses: peter-evans/create-pull-request@v3
       with:
         token: ${{ secrets.REPO_SCOPED_TOKEN }}

.github/workflows/update-rbe-images.yaml

@@ -25,10 +25,11 @@ jobs:
     - name: SKIP IF THE PR ALREADY EXISTS
       id: check-for-branch
       run: |
-        c=$(git ls-remote --exit-code --heads origin bump-rbe-image-${{ matrix.short_version }})
-        echo "::set-output name=c::$c"
+        set +e
+        git ls-remote --exit-code --heads origin bump-rbe-image-${{ matrix.short_version }}
+        echo "::set-output name=c::$?"
     - name: UPDATE RBE IMAGE SHA
-      if: steps.check-for-branch.c != 0
+      if: steps.check-for-branch.outputs.c != 0
       env:
         IMAGE: pivotalrabbitmq/rabbitmq-server-buildenv
         TAG: linux-erlang-${{ matrix.erlang_version }}
@@ -43,7 +44,7 @@ jobs:
           "dict_set exec_properties container-image:docker://${IMAGE}@${DIGEST}" \
           //:erlang_${{ matrix.short_version }}_platform || test $? -eq 3
     - name: CREATE PULL REQUEST
-      if: steps.check-for-branch.c != 0
+      if: steps.check-for-branch.outputs.c != 0
       uses: peter-evans/create-pull-request@v3
       with:
         token: ${{ secrets.REPO_SCOPED_TOKEN }}