Add build configuration system and paper image

- Add 'make paper' target to build a Paper image with plugins based on JRE
- Introduce dynamic .env and plugins.json configuration using Makefile
- Enable users to extend builds by managing their own directories in scratch/
- Implement copy_build_files macro for reproducible build management
- Add BUILDKIT_PROGRESS and DOCKER_BUILDKIT as configurable make vars

builds/basic/.env

@@ -0,0 +1,28 @@
+# While setting EULA to false in 'builds' is potentially annoying, it is done
+# intentionally to bring to attention the need to manually and explicitly agree
+# to Minecraft's EULA before being able to run or build these images
+EULA=false
+VERSION=1.20.1
+RUN_TAG=${VERSION}-paper
+
+# Builds
+VANILLA_TAG=${VERSION}
+PAPER_TAG=${VERSION}-paper
+SPIGOT_TAG=${VERSION}-spigot
+CRAFTBUKKIT_TAG=${VERSION}-craftbukkit
+
+########################
+# Extra image settings #
+########################
+#
+# JAVA_VERSION=latest
+# JRE_IMAGE=localhost/minecraft-jre
+# JDK_IMAGE=localhost/minecraft-jdk
+# JRE_TAG=latest
+# JDK_TAG=latest
+#
+# VANILLA_IMAGE=localhost/minecraft
+# PAPER_IMAGE=localhost/minecraft
+# SPIGOT_IMAGE=localhost/minecraft
+# CRAFTBUKKIT_IMAGE=localhost/minecraft
+#

builds/basic/plugins.json

@@ -0,0 +1,39 @@
+{
+  "plugins": [
+    {
+      "name": "EssentialsX",
+      "version": "2.20.1",
+      "hash": "sha256:802ea30bda460ca4597e818925816933c123b08d8126a814fac28d03a61bf542",
+      "url": "https://github.com/EssentialsX/Essentials/releases/download/${version}/EssentialsX-${version}.jar",
+      "info_url": "https://essentialsx.net/wiki/Home.html"
+    },
+    {
+      "name": "EssentialsXChat",
+      "version": "2.20.1",
+      "hash": "sha256:40aa5c20241ceb3007ebcb5cfbf19bf2c467b0c090ae50e70653ee87ab775ca6",
+      "url": "https://github.com/EssentialsX/Essentials/releases/download/${version}/EssentialsXChat-${version}.jar",
+      "info_url": "https://essentialsx.net/wiki/Module-Breakdown.html#essentialsx-chat"
+    },
+    {
+      "name": "EssentialsXSpawn",
+      "version": "2.20.1",
+      "hash": "sha256:650d7c6a33865a02c5ffa4eb710def28e73d972c9aef85b2b1f4e71b9bd261a0",
+      "url": "https://github.com/EssentialsX/Essentials/releases/download/${version}/EssentialsXSpawn-${version}.jar",
+      "info_url": "https://essentialsx.net/wiki/Module-Breakdown.html#essentialsx-spawn"
+    },
+    {
+      "name": "WorldEdit",
+      "version": "7.3.1",
+      "hash": "md5:c44cd1c16c3d84d8efc57bbf417606cb",
+      "url": "https://dev.bukkit.org/projects/worldedit/files/5326355/download",
+      "info_url": "https://dev.bukkit.org/projects/worldedit"
+    },
+    {
+      "name": "WorldGuard",
+      "version": "7.0.9",
+      "hash": "md5:70d6418dd6a2e4492a9f18e5f9ecb10c",
+      "url": "https://dev.bukkit.org/projects/worldguard/files/4675318/download",
+      "info_url": "https://dev.bukkit.org/projects/worldguard"
+    }
+  ]
+}