Remove empty env

Dockerfile

@@ -8,11 +8,6 @@ RUN GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -ldflags="-w -s" -o tweetsvg
 
 FROM scratch
 
-ENV ACCESS_TOKEN=
-ENV ACCESS_TOKEN_SECRET=
-ENV CONSUMER_KEY=
-ENV CONSUMER_SECRET=
-
 WORKDIR /app/
 COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
 COPY --from=builder /app/tweetsvg /app/tweetsvg