feat(dockerfile): make docker image run as non root user by default (#12)

Author: LiyangW

backwork/Dockerfile

@@ -5,24 +5,24 @@ LABEL maintainer="[email protected]"
 # Apply security patches
 # hadolint ignore=DL3018
 RUN echo 'http://dl-3.alpinelinux.org/alpine/edge/community' >> /etc/apk/repositories \
-    && echo 'http://dl-3.alpinelinux.org/alpine/edge/main' >> /etc/apk/repositories \
-    && apk add --no-cache \
-        bash \
-        curl \
-        libressl \
-        mariadb-client \
-        mongodb-tools \
-        mysql \
-        postgresql \
-        tini \
-    && apk add --upgrade --no-cache \
-        db \
-        expat \
-        freetype \
-        fontconfig \
-        libpng \
-        ncurses \
-        zlib
+  && echo 'http://dl-3.alpinelinux.org/alpine/edge/main' >> /etc/apk/repositories \
+  && apk add --no-cache \
+  bash \
+  curl \
+  libressl \
+  mariadb-client \
+  mongodb-tools \
+  mysql \
+  postgresql \
+  tini \
+  && apk add --upgrade --no-cache \
+  db \
+  expat \
+  freetype \
+  fontconfig \
+  libpng \
+  ncurses \
+  zlib
 
 # RUN curl -sL https://sentry.io/get-cli/ | bash
 
@@ -35,7 +35,17 @@ RUN python -m pip install --upgrade pip
 RUN pip install setuptools==57.5.0
 RUN pip install -r ./requirements.txt
 
-COPY ./docker-entrypoint.sh /
+# install sudo as root
+RUN apk add --no-cache --update sudo
+
+# add new user
+RUN adduser -D myapp \
+  && echo "myapp ALL=(ALL) NOPASSWD: ALL" > /etc/sudoers.d/myapp \
+  && chmod 0440 /etc/sudoers.d/myapp
+
+COPY --chown=myapp ./docker-entrypoint.sh /
+RUN mkdir /backups && chown myapp /backups
+USER myapp
 
 VOLUME ["/backups"]
 ENTRYPOINT ["/sbin/tini", "--"]