Fixed checksum for cosign

Author: nicholasdille

tools/cosign/Dockerfile.template

@@ -19,8 +19,9 @@ curl --silent --show-error --location --fail --output "${uniget_cache_download}/
     "${url}"
 
 echo "### Checking cosign ${COSIGN_VERSION} for bootstrapping"
+LAST_PWD="${PWD}"
 pushd "${uniget_cache_download}"
-sha256sum --check --ignore-missing checksums.txt
+sha256sum --check --ignore-missing "${LAST_PWD}/checksums.txt"
 popd
 
 install --mode=0755 \