Allow pre-releases for docker images

Author: p1c2u

Dockerfile

@@ -2,6 +2,6 @@ FROM python:3.11-alpine
 
 ARG OPENAPI_SPEC_VALIDATOR_VERSION=0.5.7
 
-RUN pip install --no-cache-dir openapi-spec-validator==${OPENAPI_SPEC_VALIDATOR_VERSION}
+RUN pip install --no-cache-dir --pre openapi-spec-validator==${OPENAPI_SPEC_VALIDATOR_VERSION}
 
 ENTRYPOINT ["openapi-spec-validator"]