Add missing and IMPORTANT script for Docker build

README.md

@@ -4,16 +4,22 @@ This repository contains the source to build an archive for both
 [Vaultwarden](https://github.com/dani-garcia/vaultwarden) and
 [Web Vault builds for Vaultwarden](https://github.com/dani-garcia/bw_web_builds).
 
-## Usage
+## Usage Docker
 
 If you have [Docker](https://www.docker.com/) installed locally, just run the following:
 
+```bash
+user@hostname$ ./build-in-container.sh
+```
+
+By default this will build the last version on Debian Bullseye and put the
+archive to `target/` directory.
+
+## Build on current host
+
 ```bash
 user@hostname$ ./build.sh
 ```
-By default this will build the last version on Debian Bullseye and put the
-archive to target/ directory.
-
 ## References
 
 * [ayosec/polybar-debian](https://github.com/ayosec/polybar-debian)

build-in-container.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+set -eu
+
+TARGET="$(dirname "$0" | xargs realpath)"
+VERSION="3.4.2"
+IMAGE="debian:bullseye"
+
+while getopts "v:i:h" opt
+do
+  case "$opt" in
+    v)
+      VERSION="$OPTARG"
+      ;;
+    i)
+      IMAGE="$OPTARG"
+      ;;
+    h)
+      echo "Usage: $0 [-i image] [-v version]"
+      exit 0
+      ;;
+    *)
+      exit 1
+      ;;
+  esac
+done
+
+docker run --rm           \
+  --name vault-build-$$ \
+  -v "$TARGET:/target"    \
+  -w /target              \
+  --user root             \
+  "$IMAGE"                \
+  sh build.sh