add build script and update Dockerfile

Dockerfile

@@ -6,7 +6,10 @@ ENV PFSENSE_PASS=none
 ENV PFSENSE_SCHEME=https
 ENV BACKUPNAME=router
 
-RUN apk update ; apk upgrade ; apk add wget ; apk add --no-cache tzdata ; apk add --no-cache bash
+# Install packages
+RUN apk update ; apk upgrade
+RUN apk add --no-cache wget tzdata bash
+RUN rm -rf /var/cache/apk/*
 
 COPY pfsense-backup.sh /
 COPY backup.sh /

build.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+
+DOCKER_IMAGE_NAME="daniel156161/pfsense-backup"
+GIT_BRANCH=$(git rev-parse --abbrev-ref HEAD)
+
+build_docker_image() {
+  TAG="$1"
+
+  echo "Building..."
+  docker build -t "$DOCKER_IMAGE_NAME:$TAG" .
+}
+
+if [ "$GIT_BRANCH" == "master" ]; then
+  GIT_BRANCH="latest"
+fi
+
+case "$1" in
+  build)
+    build_docker_image "$GIT_BRANCH"
+    ;;
+  upload)
+    build_docker_image "$GIT_BRANCH"
+    docker push "$DOCKER_IMAGE_NAME:$GIT_BRANCH"
+    ;;
+  *)
+    echo "Usage: $0 {build|upload}"
+    exit 1
+    ;;
+esac