Make Podman installation work

- Specify registries in Dockerfiles such that Podman can resolve the dependencies
- Add a name for the PHP container, such that the commands work when using `exec -it linkace-php`
- Mention in CONTRIBUTING.md that Podman works also
- Update the PHP version in CONTRIBUTING.md as proposed in https://github.com/Kovah/LinkAce/discussions/746#discussioncomment-9101259

CONTRIBUTING.md

@@ -24,12 +24,13 @@ starting to code.
 
 ### Minimum Requirements
 
-* [Docker](https://www.docker.com/products/docker-desktop) _or_ PHP 7.4
+* [Docker](https://www.docker.com/products/docker-desktop)/[Podman](https://podman.io/docs/installation) _or_ a [currently-supported PHP version](https://www.php.net/supported-versions.php)
+  * For Podman, you also need to `apt`, `dnf`, or otherwise install [`podman-compose`](https://github.com/containers/podman-compose)
 * [Node](https://nodejs.org/en/) (16 LTS)
 
 ### 1. Basic Setup
 
-The following steps assume that you are using Docker for development, which I highly encourage. If you use other ways to work with PHP projects you must adapt the commands to your system. Clone the repository to your machine and run the following commands to start the Docker container system:
+The following steps assume that you are using Docker or Podman for development, which I highly encourage. If you use other ways to work with PHP projects you must adapt the commands to your system. If you want to use Podman, simply replace the word `docker` with `podman` in each command. Clone the repository to your machine and run the following commands to start the Docker container system:
 
 ```bash
 cp .env.docker .env

docker-compose.production-simple.yml

@@ -4,7 +4,7 @@ services:
 
   # --- MariaDB
   db:
-    image: mariadb:11.2
+    image: docker.io/library/mariadb:11.2
     restart: unless-stopped
     command: mariadbd --character-set-server=utf8mb4 --collation-server=utf8mb4_bin
     environment:
@@ -17,7 +17,7 @@ services:
 
   # --- LinkAce Image with PHP and nginx
   app:
-    image: linkace/linkace:simple
+    image: docker.io/library/linkace/linkace:simple
     restart: unless-stopped
     depends_on:
       - db

docker-compose.production.yml

@@ -4,7 +4,7 @@ services:
 
   # --- MariaDB
   db:
-    image: mariadb:11.2
+    image: docker.io/library/mariadb:11.2
     restart: unless-stopped
     command: mariadbd --character-set-server=utf8mb4 --collation-server=utf8mb4_bin
     environment:
@@ -17,7 +17,7 @@ services:
 
   # --- LinkAce Image with PHP
   app:
-    image: linkace/linkace:latest
+    image: docker.io/library/linkace/linkace:latest
     restart: unless-stopped
     depends_on:
       - db
@@ -29,7 +29,7 @@ services:
 
   # --- nginx
   nginx:
-    image: bitnami/nginx:1.24
+    image: docker.io/bitnami/nginx:1.24
     restart: unless-stopped
     ports:
       - "0.0.0.0:80:8080"
@@ -45,7 +45,7 @@ services:
 
   # --- Redis
   redis:
-    image: bitnami/redis:7.2
+    image: docker.io/bitnami/redis:7.2
     restart: unless-stopped
     environment:
       - REDIS_PASSWORD=${REDIS_PASSWORD}

docker-compose.yml

@@ -5,7 +5,7 @@ services:
 
   # --- MariaDB
   db:
-    image: mariadb:11.2
+    image: docker.io/library/mariadb:11.2
     command: mariadbd --character-set-server=utf8mb4 --collation-server=utf8mb4_bin
     environment:
       - MYSQL_ROOT_PASSWORD=${DB_PASSWORD}
@@ -18,7 +18,7 @@ services:
       - linkace-db:/var/lib/mysql
 
   pg-db:
-    image: postgres:14
+    image: docker.io/library/postgres:14
     environment:
       - POSTGRES_PASSWORD=${DB_PASSWORD}
       - POSTGRES_USER=${DB_USERNAME}
@@ -30,6 +30,7 @@ services:
 
   # --- PHP
   php:
+    container_name: linkace-php
     build:
       context: .
       dockerfile: ./resources/docker/dockerfiles/development.Dockerfile
@@ -41,7 +42,7 @@ services:
 
   # --- nginx
   nginx:
-    image: bitnami/nginx:1.25
+    image: docker.io/bitnami/nginx:1.25
     ports:
       - "80:8080"
     depends_on:
@@ -52,7 +53,7 @@ services:
 
   # --- Redis
   redis:
-    image: bitnami/redis:7.2
+    image: docker.io/bitnami/redis:7.2
     environment:
       - REDIS_PASSWORD=${REDIS_PASSWORD}
     ports:

resources/docker/dockerfiles/development.Dockerfile

@@ -1,7 +1,7 @@
 # DOCKERFILE DEVELOPMENT
 # Installs MySQL Client for database exports, xDebug with PCov and Composer
 
-FROM php:8.1.10-fpm
+FROM docker.io/library/php:8.1.10-fpm
 WORKDIR /app
 
 RUN apt-get update && apt-get install -y \

resources/docker/dockerfiles/release-base.Dockerfile

@@ -1,4 +1,4 @@
-FROM php:8.3-fpm-alpine
+FROM docker.io/library/php:8.3-fpm-alpine
 
 # Install package and PHP dependencies
 RUN apk add --no-cache mariadb-client postgresql postgresql-dev sqlite zip libzip-dev; \

resources/docker/dockerfiles/release-multiplatform-simple.Dockerfile

@@ -1,5 +1,5 @@
 # DOCKERFILE RELEASE
-FROM linkace/linkace:latest
+FROM docker.io/library/linkace/linkace:latest
 
 # Install nginx and supervisor
 RUN apk add --no-cache nginx supervisor

resources/docker/dockerfiles/release-multiplatform.Dockerfile

@@ -2,7 +2,7 @@
 
 # ================================
 # PHP Dependency Setup
-FROM linkace/base-image:php-8.3-alpine AS builder
+FROM docker.io/library/linkace/base-image:php-8.3-alpine AS builder
 WORKDIR /app
 
 # Pull composer and install required packages