Agent Guidelines for FrankenPHP Docker Images

Build Commands

Build specific variant:

docker buildx bake runner-php-8-4-bookworm

HCL: 4-space indentation, descriptive variables (e.g.,
```
IMAGE_NAME
```
,
```
PHP_VERSION
```
)
Shell: Use
```
set -exo pipefail
```
, proper quoting, environment variable prefixes
Docker: Multi-platform builds (
```
linux/amd64
```
,
```
linux/arm64
```
), proper labels
Tags: Use semantic versioning, clean tag function for sanitization
Functions: HCL functions for reusable logic (tag generation, version parsing)
Matrix builds: Support multiple PHP versions and OS variants
Labels: Include OpenContainers standard labels with metadata

Build specific variant:

docker buildx bake runner-php-8-4-bookworm

HCL: 4-space indentation, descriptive variables (e.g.,
```
IMAGE_NAME
```
,
```
PHP_VERSION
```
)
Shell: Use
```
set -exo pipefail
```
, proper quoting, environment variable prefixes
Docker: Multi-platform builds (
```
linux/amd64
```
,
```
linux/arm64
```
), proper labels
Tags: Use semantic versioning, clean tag function for sanitization
Functions: HCL functions for reusable logic (tag generation, version parsing)
Matrix builds: Support multiple PHP versions and OS variants
Labels: Include OpenContainers standard labels with metadata