Updates goflow docs installation in Dockerfile

docker/Dockerfile

@@ -11,8 +11,9 @@ RUN addgroup -S golang \
 
 COPY . .
 
-RUN export GOFLOW_VERSION=$(grep goflow go.mod | cut -d" " -f2 | cut -c2-) && curl https://codeload.github.com/nyaruka/goflow/tar.gz/v$GOFLOW_VERSION | tar --wildcards --strip=1 -zx "goflow-${GOFLOW_VERSION}/docs/*"
-RUN cp ./docs/en-us/*.* docs/
+RUN curl -L https://github.com/nyaruka/goflow/releases/download/v$(grep goflow go.mod | cut -d" " -f2 | cut -c2-)/docs.tar.gz --output docs.tar.gz && \
+    tar -xf docs.tar.gz && rm docs.tar.gz
+
 
 RUN go install -v ./cmd/...