build(docker): Local Docker image build/testing

docker/Dockerfile.headless

@@ -0,0 +1 @@
+Dockerfile

docker/testing/Makefile

@@ -0,0 +1,46 @@
+# Local building and testing of the Docker image variants.
+
+# Defensive settings for make:
+#     https://tech.davis-hansson.com/p/make/
+SHELL:=bash
+.ONESHELL:
+.SHELLFLAGS:=-eu -o pipefail -c
+.SILENT:
+.DELETE_ON_ERROR:
+MAKEFLAGS+=--warn-undefined-variables
+MAKEFLAGS+=--no-builtin-rules
+export PS1?=$$
+# Prefix echoed recipe commands with the recipe line number for debugging:
+export PS4?=:$$LINENO+
+
+VARIANTS=headless gui ubuntu
+ROOT_PREREQS:=$(shell find ../root -type f)
+
+# Finished with `$(shell)`, echo recipe commands going forward
+.SHELLFLAGS+= -x
+
+
+### Top-level targets:
+
+.PHONY: all
+all: build
+
+.PHONY: build
+build: $(VARIANTS:%=./build/ytdl-sub-%.log)
+
+.PHONY: run
+run: build $(VARIANTS:%=./volumes/ytdl-sub-%/)
+	docker compose up
+
+
+### Real targets:
+
+# Re-build the local images when changes require it.
+./build/ytdl-sub-%.log: ../Dockerfile.% $(ROOT_PREREQS)
+	mkdir -pv "$(dir $(@))"
+	docker compose build "$(@:build/ytdl-sub-%.log=ytdl-sub-%)" |&
+	    tee -a "$(@)"
+
+# Ensure volumes are owned by the developer's normal user:
+./volumes/ytdl-sub-%/:
+	mkdir -pv "$(@)"

docker/testing/docker-compose.yml

@@ -1,5 +1,8 @@
 services:
   ytdl-sub-gui:
+    build:
+      context: "../"
+      dockerfile: "./Dockerfile.gui"
     image: "ytdl-sub-gui:local"
     container_name: "ytdl-sub-gui"
     environment:
@@ -13,9 +16,11 @@ services:
     ports:
       - "8443:8443"
     restart: "unless-stopped"
-  ytdl-sub:
-    image: "ytdl-sub:local"
-    container_name: "ytdl-sub"
+  ytdl-sub-headless:
+    build:
+      context: "../"
+    image: "ytdl-sub-headless:local"
+    container_name: "ytdl-sub-headless"
     environment:
       PUID: "1000"
       PGID: "1000"
@@ -23,9 +28,12 @@ services:
       CRON_SCHEDULE: '"*/1 * * * *"'
       CRON_RUN_ON_START: "true"
     volumes:
-      - "./volumes/ytdl-sub/:/config/"
+      - "./volumes/ytdl-sub-headless/:/config/"
     restart: "unless-stopped"
   ytdl-sub-ubuntu:
+    build:
+      context: "../"
+      dockerfile: "./Dockerfile.ubuntu"
     image: "ytdl-sub-ubuntu:local"
     container_name: "ytdl-sub-ubuntu"
     environment:

docs/source/guides/development/index.rst

@@ -64,6 +64,20 @@ If integration tests are failing, ensure...
 - your local ``ytdl-sub`` dependencies are up-to-date
 
 
+Docker
+------
+
+Test changes to the Docker image variants locally:
+
+.. code-block:: shell
+
+   cd ./docker/testing/
+   make -j run
+
+See ``./docker/testing/docker-compose.yml`` for the Compose services for each image
+variant.
+
+
 IDE Setup
 ---------