Rework docker setup

docker/dockerfiles/tools.dockerfile

@@ -0,0 +1,35 @@
+FROM alpine:latest
+
+# Builds an image where all scripts in tools/ are in PATH. There are
+# no assumptions what script to run, so there are no CMD or
+# ENTRYPOINTS defined.
+#
+# The scripts are named is in tools/ only prefixed by `ds-`
+#
+# Run the export-files script, for example:
+#
+#   docker run -e DS_USER=demo -e DS_PASS=test docspell/tools:dev ds-export-files "http://localhost" .
+#
+# The build requires to either specify a version build argument or a
+# tools_url build argument. If a tools_url argument is given, then
+# this url is used to download the tools zip file. Otherwise the
+# version argument is used to download from github.
+
+LABEL maintainer="eikek0 <eike@docspell.org>"
+
+ARG version=
+ARG tools_url=
+
+RUN apk add --no-cache curl bash inotify-tools jq sqlite
+
+WORKDIR /opt
+RUN wget ${tools_url:-https://github.com/eikek/docspell/releases/download/v$version/docspell-tools-$version.zip} && \
+  unzip docspell-tools-*.zip && \
+  rm docspell-tools-*.zip
+
+RUN bash -c 'while read f; do \
+    target="ds-$(basename "$f" ".sh")"; \
+    echo "Installing $f -> $target"; \
+    cp "$f" "/usr/local/bin/$target"; \
+    chmod 755 "/usr/local/bin/$target"; \
+  done < <(find /opt/docspell-tools-* -name "*.sh" -mindepth 2 -not -path "*webextension*")'