add IS_PR_BUILD to env for Release.yaml

Signed-off-by: Travis Cotton <trcotton@lanl.gov>

Author: travisbcotton

.github/workflows/Release.yml

@@ -49,6 +49,7 @@ jobs:
           echo "GO_VERSION=$(go version | awk '{print $3}')" >> $GITHUB_ENV
           echo "BUILD_USER=$(whoami)" >> $GITHUB_ENV
           echo "CGO_ENABLED=1" >> $GITHUB_ENV
+          echo "IS_PR_BUILD=false" >> $GITHUB_ENV
       - name: Docker Login
         uses: docker/login-action@v4.1.0
         with: