Add docker operation mode

Dockerfile

@@ -0,0 +1,15 @@
+# Install conda dependencies
+FROM mambaorg/micromamba:1.5.8
+COPY --chown=$MAMBA_USER:$MAMBA_USER env.yaml /tmp/env.yaml
+RUN micromamba install -y -n base -f /tmp/env.yaml && micromamba clean --all --yes
+ARG MAMBA_DOCKERFILE_ACTIVATE=1 
+
+# Set up transition repo
+COPY --chown=$MAMBA_USER:$MAMBA_USER . lesson-transition
+WORKDIR lesson-transition
+RUN R -e 'options(renv.config.pak.enabled = TRUE); renv::restore()'
+
+# This disables the interactive parts of the script
+ENV CI=1 GITHUB_PAT=
+# The .module-ignore seems to prevent certain lessons from being converted, so we truncate it
+RUN > .module-ignore

README.md

@@ -737,6 +737,34 @@ if there are no changes you wish to make
 If your lesson is in a repository that does not belong to an official carpentries
 account, you will need to append the `DIRS` varaible in the makefile.
 
+### Docker
+
+If you don't find it easy to get this project running, you might find the Docker version a bit easier, because it handles all necessary dependencies for you.
+All you need to do is have Docker itself installed.
+
+To perform a conversion using Docker, clone the repo, then:
+
+```
+# Build the container. This need only be done once
+docker build . --tag lesson-transition
+# Prepare the output directory
+mkdir -m a=rwx output
+# Perform the conversion
+docker run \
+   --env GITHUB_PAT=ghp_XXX \
+   --env GITHUB_ACTOR=bot \
+   --volume ${PWD}/output:/tmp/lesson-transition/sandpaper \
+   lesson-transition \
+   make sandpaper/<ORG>/<REPO>.json
+```
+
+For example, for the `carpentries-incubator/docker-introduction` repo, this last line would be:
+```
+make sandpaper/carpentries-incubator/docker-introduction.json
+```
+
+Results will be in `output/<ORG>/<REPO>`, although you might have to `chown` them back to the correct user.
+
 ## Requirements
 
 This repository has package management via {renv}, so there are two steps to
@@ -795,4 +823,3 @@ the pages need to be activated, which you can do via usethis:
 library(usethis)
 use_github_pages()
 ```
-

env.yaml

@@ -0,0 +1,17 @@
+name: base
+channels:
+  - conda-forge
+dependencies:
+  - conda-forge::python
+  - conda-forge::r-base==4.3.2
+  - conda-forge::gh
+  - conda-forge::git
+  - conda-forge::pandoc==2.19.2
+  - conda-forge::libxml2
+  - conda-forge::libxslt
+  - conda-forge::freetype
+  - conda-forge::fontconfig
+  - conda-forge::pkg-config
+  - conda-forge::jq
+  - pip:
+    - git-filter-repo

renv.lock

@@ -1133,14 +1133,14 @@
     },
     "xslt": {
       "Package": "xslt",
-      "Version": "1.4.4",
+      "Version": "1.4.5",
       "Source": "Repository",
-      "Repository": "RSPM",
+      "Repository": "CRAN",
       "Requirements": [
         "Rcpp",
         "xml2"
       ],
-      "Hash": "e2c9cc5c470a5a3a4c1d458404f1a034"
+      "Hash": "1ff6a2b18d8937ec8f39bb7c9385d2b8"
     },
     "yaml": {
       "Package": "yaml",