Dockerfile creates volumes for secrets & logs

- Renamed logs folder to kebab-case
- All logger error variables renamed to err

Dockerfile

@@ -16,6 +16,14 @@ EXPOSE 8000
 
 RUN apk add --no-cache ca-certificates
 
+RUN mkdir -p /etc/secrets
+VOLUME /etc/secrets
+
+RUN mkdir -p /var/log/planetposen-logs
+VOLUME /var/log/planetposen-logs
+
 COPY --from=builder /go/src/github.com/kevinmidboe/planetposen-images .
 
+ENV GOOGLE_APPLICATION_CREDENTIALS=/etc/secrets/sa-key.json
+
 CMD ["./main"]