add container build

Makefile

@@ -7,13 +7,33 @@ ifndef SPINCFG
 SPINCFG = spin.toml
 endif
 
-all: local
+ifndef SPINVER
+SPINVER = v0.4.0
+endif
+
+ifndef ARCH
+ARCH = amd64
+endif
+
+ifndef OS
+OS = linux
+endif
 
-local: wasm/tpl.wasm
+ifndef SPINBIN
+SPINBIN = https://github.com/fermyon/spin/releases/download/$(SPINVER)/spin-$(SPINVER)-$(OS)-$(ARCH).tar.gz
+endif
+
+.PHONY: run watch deploy container
+
+all: run
+run: wasm/tpl.wasm
 	sh -c '$(SPINFLAGS) spin up --file $(SPINCFG)'
 
 watch: wasm/tpl.wasm
 	nodemon --watch cgi-bin --watch www --watch lib --ext pl,html,php --verbose --legacy-watch --signal SIGINT --exec '$(SPINFLAGS) spin up --file $(SPINCFG)'
 
+container:
+	nixpacks build . --name php --pkgs wget --install-cmd 'wget -O spin.tar.gz $(SPINBIN) && tar xvf spin.tar.gz' --start-cmd './spin up --file spin.toml'
+
 deploy: wasm/tpl.wasm
-	ssh ubuntu@php.energy 'cd php && git pull && sudo systemctl restart php'
+	ssh ubuntu@php.energy 'cd php && git pull && sudo systemctl restart php'

README.md

@@ -13,7 +13,8 @@ Head on over to our beautiful homepage at [php.energy](https://php.energy/). Sou
 
 0. ~~Reconsider whether you really want to do this~~.
 1. [Install Spin](https://spin.fermyon.dev/quickstart/).
-  1. For hot reloading, [install nodemon](https://www.npmjs.com/package/nodemon) (optional).
+2. For hot reloading, [install nodemon](https://www.npmjs.com/package/nodemon) (optional).
+3. For building the container image, [install nixpacks](https://nixpacks.com/docs/getting-started).
 2. Clone this repo.
 3. Configure the www root in `spin.toml`
 4. Put PHP scripts or Prolog programs in `public_html` or `cgi-bin`.
@@ -22,6 +23,11 @@ Head on over to our beautiful homepage at [php.energy](https://php.energy/). Sou
 - Run server with `make` or `spin up`.
 - Or use `make watch` for hot reloading.
 
+## Build
+1. [Install nixpacks](https://nixpacks.com/docs/getting-started).
+2. Build a Docker container image with `make container`.
+3. See Makefile for settings.
+
 ## How does it work?
 
 It just runs the WebAssembly version of Trealla Prolog and writes CGI ([RFC 3875](https://datatracker.ietf.org/doc/html/rfc3875)) output to stdout.