ignore prerelease verions when uploading version file on release

.github/scripts/update-version-file.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+set -ue
+
+BIN="syft"
+DISTDIR=$1
+VERSION=$2
+
+if [[ $VERSION == *-* ]] ; then
+   echo "skipping publishing a version file (this is a pre-release: ${VERSION})"
+   exit 0
+fi
+
+echo "creating and publishing version file"
+
+# create a version file for version-update checks
+echo "${VERSION}" | tee ${DISTDIR}/VERSION
+
+# upload the version file that supports the application version update check
+docker run --rm \
+    -i \
+    -e AWS_DEFAULT_REGION=us-west-2 \
+    -e AWS_ACCESS_KEY_ID=${AWS_ACCESS_KEY_ID} \
+    -e AWS_SECRET_ACCESS_KEY=${AWS_SECRET_ACCESS_KEY} \
+    -v $(pwd)/${DISTDIR}/:/distmount \
+    amazon/aws-cli \
+        s3 cp /distmount/VERSION s3://toolbox-data.anchore.io/${BIN}/releases/latest/VERSION