add github action, build script, docker ignore

build.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+echo "Creating build environment"
+docker buildx create --name pibuilder --use
+
+echo "Printing build environment info"
+docker buildx inspect --bootstrap
+
+echo "Doing build"
+docker buildx build \
+    --platform linux/arm64 \
+    --push \
+    -t gitea.coupxd.com/cody/hello-fastapi:latest \
+    .
+