feature(dockerfile): initial dockerfile

Dockerfile

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+#
+# Dart-SASS compiler on Alpine
+#
+
+ARG ALPINE_VERSION=3.14
+FROM alpine:${ALPINE_VERSION}
+ARG ALPINE_VERSION
+ARG SASS_VERSION=1.35.1
+
+# create a limited user to run sass
+ARG SASS_UID=8101
+ARG SASS_GID=8101
+RUN addgroup -g ${SASS_GID} -S sass \
+    && adduser -S -u ${SASS_UID} -G sass -H -g 'sass system user' sass \
+    && mkdir /sass/sass /sass/css \
+    && chown -R sass:sass /sass
+
+# download dart-sass, tini and timezone support, update all packages
+RUN apk --update --no-cache add \
+        tini \
+        tzdata \
+    && apk --update --no-cache upgrade \
+    && wget https://github.com/sass/dart-sass/releases/download/${SASS_VERSION}/dart-sass-${SASS_VERSION}-linux-x64.tar.gz \
+        -O /tmp/dart-sass-${SASS_VERSION}.tar.gz \
+    && tar -zxvf /tmp/dart-sass-${SASS_VERSION}.tar.gz dart-sass/sass -C /usr/local/bin/sass \
+    && chmod +x /usr/local/bin/sass
+
+# labels
+MAINTAINER Asif Bacchus <asif@asifbacchus.dev>
+LABEL maintainer="Asif Bacchus <asif@asifbacchus.dev>"
+LABEL dev.asifbacchus.docker.internalName="ab-dart-sass"
+LABEL org.opencontainers.image.authors="Asif Bacchus <asif@asifbacchus.dev>"
+LABEL org.opencontainers.image.description="Dockerized implementation of Dart-SASS compiler running on Alpine Linux using a limited account."
+LABEL org.opencontainers.image.documentation="https://git.asifbacchus.dev/ab-docker/dart-sass/raw/branch/master/README.md"
+LABEL org.opencontainers.image.source="https://git.asifbacchus.dev/ab-docker/dart-sass.git"
+LABEL org.opencontainers.image.title="ab-dart-sass"
+LABEL org.opencontainers.image.url="https://git.asifbacchus.dev/ab-docker/dart-sass"
+LABEL org.opencontainers.image.vendor="Asif Bacchus"
+
+# default environment variables
+ENV TZ=Etc/UTC
+ENV SASS_STYLE=compressed
+
+# switch to user account and run sass compiler
+USER sass
+WORKDIR /sass
+ENTRYPOINT [ "/sbin/tini", "--", "/usr/local/bin/sass -s ${SASS_STYLE} --watch --poll --stop-on-error sass:css" ]
+
+# set build timestamp, git and version labels
+ARG INTERNAL_VERSION
+ARG GIT_COMMIT
+ARG BUILD_DATE
+LABEL dev.asifbacchus.docker.internalVerson=${INTERNAL_VERSION}
+LABEL org.opencontainers.image.version="Dart-SASS ${SASS_VERSION}"
+LABEL org.opencontainers.image.revision=${GIT_COMMIT}
+LABEL org.opencontainers.image.created=${BUILD_DATE}
+
+#EOF