Added barebones structure of building with Static PHP

spc/.gitignore

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+buildroot
+downloads
+log
+pkgroot
+source
+pie.elf
+pie.phar
+spc

spc/build.sh

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+#!/usr/bin/env bash
+
+set -xeuo pipefail
+
+SPC_ROOT=$(dirname "$0")
+
+# First up, build the regular pie.phar
+cd "$SPC_ROOT/.."
+php box.phar compile
+mv pie.phar "$SPC_ROOT/pie.phar"
+
+cd $SPC_ROOT
+
+# Build the static PHP micro.sfx
+./spc craft
+
+# Combine pie.phar with the micro.sfx
+./spc micro:combine pie.phar --output=pie.elf
+
+# Docker build & run the test with it
+docker build --file spc.Dockerfile --tag pie-spc-test .
+docker run --rm -ti pie-spc-test

spc/craft.yml

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+php-version: 8.4
+extensions: "curl,filter,iconv,openssl,phar,zlib"
+sapi: micro
+download-options:
+  prefer-pre-built: true

spc/spc.Dockerfile

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+# docker build --file spc.Dockerfile --tag pie-spc-test .
+# docker run --rm -ti pie-spc-test
+FROM php:7.4-cli
+
+# need
+RUN apt-get update && \
+    apt-get install -y git
+
+COPY pie.elf /usr/bin/pie
+
+CMD ["pie", "install", "asgrim/example-pie-extension"]