linux: switch to self made image

That we can install additonal packages and have
manpages.
Use a docker-compose for the build and image specification
and for the mount paths, that the build-images action
also builds this image.
At least we know that the image can be built.

.devcontainer/linux/.dockerignore

@@ -0,0 +1 @@
+**

.devcontainer/linux/Dockerfile

@@ -0,0 +1,13 @@
+FROM mcr.microsoft.com/devcontainers/base:ubuntu-22.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+            nano \
+            tmux \
+            vim \
+    && yes | unminimize \
+    && rm -rf /var/lib/apt/lists/*
+
+CMD ["tail", "-f", "/dev/null"]

.devcontainer/linux/devcontainer.json

@@ -1,6 +1,8 @@
 {
     "name": "Jumpstart linux part",
-    "image": "mcr.microsoft.com/devcontainers/base:ubuntu-22.04",
+    "dockerComposeFile": "./docker-compose.yml",
+    "service": "linux-devcontainer",
+    "workspaceFolder": "/workspace",
     "features": {
         "ghcr.io/devcontainers/features/docker-in-docker:2": {
             "dockerDashComposeVersion": "v2"

.devcontainer/linux/docker-compose.yml

@@ -0,0 +1,6 @@
+services:
+  linux-devcontainer:
+    image:  ${REGISTRY:-ghcr.io}/${REPO_OWNER:-scs}/${REPO_NAME:-jumpstart-docs}/linux-devcontainer:${VERSION:-latest}
+    build: .
+    volumes:
+      - "../../:/workspace:cached"