attempt fix (#465)

stage/Dockerfile

@@ -26,7 +26,7 @@ ENV PATH="$POETRY_HOME/bin:${PATH}"
 SHELL ["/bin/sh", "-o", "pipefail", "-c"]
 
 # hadolint ignore=DL3018
-RUN apk update && apk add --no-cache curl gcc musl-dev libffi-dev jq
+RUN apk update && apk add --no-cache curl gcc musl-dev libffi-dev jq postgresql-dev
 # I could not make the linter accept 4006, so I will put this here. Whoever is interested should find a way to resolve this without ignoring. 
 # hadolint ignore=DL4006
 RUN curl -sSL https://install.python-poetry.org | python3 -