misc: update build script to support containers created with apx/dbox…

…/tbox

build.sh

@@ -1 +1,33 @@
-flatpak-spawn --host flatpak run org.flatpak.Builder build com.usebottles.bottles.yml --user --install --force-clean && flatpak-spawn --host flatpak run com.usebottles.bottles
+#!/bin/sh
+
+run_flatpak() {
+    flatpak-spawn --host flatpak run org.flatpak.Builder build com.usebottles.bottles.yml --user --install --force-clean && flatpak-spawn --host flatpak run com.usebottles.bottles
+}
+
+run_host() {
+    flatpak run org.flatpak.Builder build com.usebottles.bottles.yml --user --install --force-clean && flatpak run com.usebottles.bottles
+}
+
+run_container() {
+    host-spawn flatpak run org.flatpak.Builder build com.usebottles.bottles.yml --user --install --force-clean && host-spawn flatpak run com.usebottles.bottles
+}
+
+if [ -x "$(command -v flatpak-spawn)" ]; then
+    run_flatpak
+    exit $?
+fi
+
+if [ -f "/run/.containerenv" ]; then
+    if [ -x "$(command -v flatpak)" ]; then
+        run_host
+        exit $?
+    fi
+
+    if [ -x "$(command -v host-spawn)" ]; then
+        run_container
+        exit $?
+    fi
+
+    echo "Looks like you are running in a container, but you don't have flatpak or host-spawn installed."
+    echo "Nothing to do here."
+fi