clean up docker/justfiles for building diff versions

Dockerfile

@@ -1,9 +1,9 @@
-ARG BASE_VERSION=3.12
+ARG BASE_VERSION="3.12"
 FROM alpine:$BASE_VERSION
 
-ENV OVERLAY_VERSION "v2.1.0.2"
-ENV OVERLAY_ARCH "amd64"
-ENV OVERLAY_RELEASE_URL "https://github.com/just-containers/s6-overlay/releases/download/${OVERLAY_VERSION}/s6-overlay-${OVERLAY_ARCH}-installer"
+ARG OVERLAY_VERSION="v2.1.0.2"
+ARG OVERLAY_ARCH="amd64"
+ARG OVERLAY_RELEASE_URL="https://github.com/just-containers/s6-overlay/releases/download/${OVERLAY_VERSION}/s6-overlay-${OVERLAY_ARCH}-installer"
 
 WORKDIR /tmp
 RUN apk add --no-cache \

README.md

@@ -1,3 +1,5 @@
+[![Docker Pulls](https://img.shields.io/docker/pulls/andrewzah/base-alpine)](https://hub.docker.com/r/andrewzah/base-alpine)
+
 # s6-alpine
 
 alpine + [s6 overlay](https://skarnet.org/software/s6/overview.html)

justfile

@@ -1,10 +1,14 @@
-set positional-arguments := true
+alpine_version := '3.12'
 
-@build BASE_VERSION:
+build v=alpine_version:
   docker build . \
-    --build-arg "BASE_VERSION=$1" \
-    -t "andrewzah/base-alpine:$1"
+    --build-arg="BASE_VERSION={{v}}" \
+    -t "andrewzah/base-alpine:{{v}}"
 
-@push BASE_VERSION:
-  just build $1
-  docker push "andrewzah/base-alpine:$1"
+buildall:
+  just build 3.12
+  just build 3.13
+
+pushall:
+  docker push "andrewzah/base-alpine:3.12"
+  docker push "andrewzah/base-alpine:3.13"