add script to build docker image

build-container-image.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+echo "Reseting invidious-companion repository (git reset --hard origin/HEAD)"
+sh -c './reset-companion-repo.sh'
+echo "Applying patches (git am ../patches/*.patch)"
+sh -c './apply-patches.sh'
+echo "Building container image"
+
+docker_cmd='docker buildx build ./invidious-companion'
+if eval "$docker_cmd"; then
+	echo "Done"
+else
+	echo "Failed to execute $docker_cmd"
+fi