Support Lab 2.x/3rc, add GitHub actions (#23)

Author: bollwyvl

binder/apt.txt renamed to .binder/apt.txt

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+@jupyter-widgets/jupyterlab-manager
+@jupyterlab/toc

.binder/labex.txt

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+#!/usr/bin/env bash
+
+# we already know which python and lab we want
+export RFJL_LOCKDIR=test/linux-64/py3.9/lab3
+
+# some things we just don't need to do on binder
+export IN_BINDER=1
+
+set -eux
+
+conda create \
+    --yes \
+    --prefix "${NB_PYTHON_PREFIX}" \
+    --file ".github/locks/${RFJL_LOCKDIR}/conda.lock"
+
+# do a proper activation
+source activate "${NB_PYTHON_PREFIX}"
+
+doit

.binder/postBuild

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+channels:
+  - conda-forge
+  - nodefaults
+  - msys2
+dependencies:
+  # enough stuff to run doit
+  - doit
+  - pip
+  - pyyaml
+  # really nothing for it
+  - nodejs >=10,!=11.*,!=13.*,!=15.*,!=17.*
+  # hard deps
+  - robotframework >=3.2
+  - robotframework-seleniumlibrary >=4.5

.github/env_specs/_base.yml

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+dependencies:
+  - nbsphinx
+  - sphinx
+  - sphinx_rtd_theme
+  - sphinx-autobuild
+  - port-for =0.3.1
+  - ipykernel

.github/env_specs/docs.yml

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+dependencies:
+  - jupyterlab >=1,<2
+  - ipywidgets

.github/env_specs/lab1.yml

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+dependencies:
+  - jupyterlab >=2,<3
+  - ipywidgets

.github/env_specs/lab2.yml

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+# TODO: fully support in the matrix
+
+channels:
+  - conda-forge/label/jupyterlab_widgets_rc
+  - conda-forge/label/jupyterlab_server_rc
+  - conda-forge/label/jupyterlab_rc
+  - conda-forge
+  - nodefaults
+
+dependencies:
+  - ipywidgets
+  - jupyter_server =1.0.7
+  - jupyterlab >=3.0.0rc7
+  - jupyterlab_server >=2.0.0rc1
+  - jupyterlab_widgets >=1.0.0a6

.github/env_specs/lab3.yml

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+dependencies:
+  - black
+  - flake8
+  - isort <5
+  - robotframework-lint
+  - yarn <2

.github/env_specs/lint.yml

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+dependencies:
+  - python >=3.6,<3.7