Rework docker setup

docker/dockerfiles/build.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+
+if [ -z "$1" ]; then
+    echo "Please specify a version"
+    exit 1
+fi
+
+version="$1"
+if [[ $version == v* ]]; then
+    version="${version:1}"
+fi
+
+cd "$(dirname "$0")"
+
+echo "============ Building Tools ============"
+docker build \
+       --build-arg version=$version \
+       --tag docspell/tools:v$version \
+       --tag docspell/tools:latest \
+       -f tools.dockerfile .
+
+echo "============ Building Restserver ============"
+docker build \
+       --build-arg version=$version \
+       --tag docspell/restserver:v$version \
+       --tag docspell/restserver:latest \
+       -f restserver.dockerfile .
+
+echo "============ Building Joex ============"
+docker build \
+       --build-arg version=$version \
+       --tag docspell/joex:v$version \
+       --tag docspell/joex:latest \
+       -f joex.dockerfile .