Add dev containers, musl build

containers/build.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env sh
+
+set -eu
+suffix=$(printf '%s' "$1" | sed 's/.*\.//')
+tag="en:$suffix"
+
+if podman container exists "$tag"; then
+    podman stop --time 3 "$tag"
+fi
+
+if [ "$suffix" = 'debian-dev' ]; then
+    cp -v ../target/x86_64-unknown-linux-gnu/release/en en
+elif [ "$suffix" = 'alpine-dev' ]; then
+    cp -v ../target/x86_64-unknown-linux-musl/release/en en
+fi
+
+podman build \
+    --tag "$tag" \
+    -f "Containerfile.$suffix"
+
+if [ -f en ]; then
+    rm -v en
+fi