*: python pip in debian bookworm/testing needs venv

When testing this build using the upcoming debian bookworm/testing, the
python pip v3.11 fails to install requirements that may clobber the host
install packages. It prints out that venv must be used.

This change works fine on the current debian bullseye, and will continue
to work once folks switch to the upcoming debian bookworm release.

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>

Dockerfile-build

@@ -8,7 +8,8 @@ RUN curl -fsSL https://deb.nodesource.com/setup_18.x | bash
 RUN apt-get install -y \
     build-essential \
     nodejs \
-    python3-pip
+    python3-pip \
+    python3-venv
 
 WORKDIR /app
 ADD Makefile .

Makefile

@@ -110,8 +110,9 @@ build-deps-ubuntu:
 
 docs: docs-deps docs-build
 
-docs-build: .PHONY
+docs-build: venv .PHONY
-	@if ! /bin/echo -e "import sys\nif sys.version_info < (3,8):\n exit(1)" | python3; then \
+	@. venv/bin/activate && \
+	if ! /bin/echo -e "import sys\nif sys.version_info < (3,8):\n exit(1)" | python3; then \
 	  if which python3.8; then \
 	  	echo "python3.8 $(shell which mkdocs) build"; \
 	    python3.8 $(shell which mkdocs) build; \
@@ -124,10 +125,15 @@ docs-build: .PHONY
 	  mkdocs build; \
 	fi
 
-docs-deps: .PHONY
+venv:
+	python3 -m venv ./venv
+
+docs-deps: venv .PHONY
+	. venv/bin/activate && \
 	pip3 install -r requirements.txt
 
-docs-deps-update: .PHONY
+docs-deps-update: venv .PHONY
+	. venv/bin/activate && \
 	pip3 install -r requirements.txt --upgrade