Fixing doctests in gh workflow

(cherry picked from commit 74600fe)

.gitignore

@@ -28,3 +28,9 @@ venv
 .venv
 user.mk
 .vscode
+shell.nix
+vscode.sh
+clean.sh
+.envrc
+.vscode-extensions
+core

Makefile

@@ -126,6 +126,13 @@ tx_force_pull_translations:
 	$(eval comma += ,)
 	tx pull -f --parallel --mode onlytranslated -l $(subst $(space),$(comma),$(subst en$(space),,$(subst zh_,zh-,$(LANGUAGES)))) ;
 
+doctest-gh:
+	# --system-site-packages needed to keep QGIS libs in python path
+	export PYTHONPATH=$(PYTHONPATH):/usr/lib/python3/dist-packages && \
+	. /docsenv/bin/activate --system-site-packages && LD_PRELOAD=/lib/x86_64-linux-gnu/libSegFault.so $(SPHINXBUILD) -b doctest . $(BUILDDIR)/doctest
+	@echo "Testing of doctests in the sources finished, look at the " \
+	      "results in $(BUILDDIR)/doctest/output.txt."
+
 doctest:
 	LD_PRELOAD=/lib/x86_64-linux-gnu/libSegFault.so $(SPHINXBUILD) -b doctest . $(BUILDDIR)/doctest
 	@echo "Testing of doctests in the sources finished, look at the " \

doctest.dockerfile

@@ -2,8 +2,11 @@ FROM qgis/qgis:3.34
 
 # Install requirement first to use caching
 COPY REQUIREMENTS.txt /documentation/REQUIREMENTS.txt
-RUN pip3 install -r /documentation/REQUIREMENTS.txt
+
+# make the venv in /docsenv
+WORKDIR /
+RUN python3 -m venv docsenv && . docsenv/bin/activate && pip3 install -r /documentation/REQUIREMENTS.txt
 
 WORKDIR /documentation
 
-CMD make doctest
+CMD make doctest-gh