Added Dockerfile

Dockerfile

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+FROM nimlang/nim:alpine as nim
+MAINTAINER setenforce@protonmail.com
+EXPOSE 8080
+ENV HOSTNAME nitter.net
+
+COPY . /src/nitter
+WORKDIR /src/nitter
+
+RUN apk update \
+    && apk add python3 python3-dev bash libsass libsass-dev chromium chromium-chromedriver libffi libffi-dev openssl-dev \
+    && pip3 install --upgrade pip && pip3 install -U seleniumbase pytest \
+    && nimble build -y -d:release -d:hostname=${HOSTNAME} \
+    && nimble scss \
+    && mkdir -p ./tmp \
+    && bash -c "./nitter & cd tests && pytest --headless -n 8 --reruns 5 --reruns-delay 1 && kill %1"
+
+FROM alpine
+WORKDIR /src/
+COPY --from=nim /src/nitter .
+RUN apk add pcre-dev sqlite-dev
+CMD ./nitter