docs: borrow poetry version from docs/pyproject.toml

In order make docs build reproducible we need to lock poetry version.
It will also help with pip cache invalidation on the pipeline, hash will
be calculated from `docs/pyproject.toml`.
Does two things:
1. Lock poetry version in `docs/pyproject.toml`
2. Pull version from `docs/pyproject.toml` in `Makefile`

Author: dkropachev

docs/Makefile

@@ -1,5 +1,6 @@
 # Global variables
 # You can set these variables from the command line.
+SHELL         = bash
 POETRY        = poetry
 SPHINXOPTS    = -j auto
 SPHINXBUILD   = $(POETRY) run sphinx-build
@@ -19,8 +20,22 @@ all: dirhtml
 # Setup commands
 .PHONY: setupenv
 setupenv:
-	pip install -q poetry
 	sudo apt-get install gcc python3-dev libev4 libev-dev
+	@while IFS= read -r line; do \
+      if [[ "$${line}" =~ ^[[:space:]]*requires[[:space:]]*= ]]; then\
+        content="$${line#*=}";\
+        content="$${content//[[:space:]]/}";\
+        content="$${content#[}";\
+        content="$${content%]}";\
+        IFS=',' read -ra items <<< "$$content";\
+        for item in "$${items[@]}"; do\
+          item="$${item%\"}";\
+          item="$${item#\"}";\
+          pip install "$$item";\
+        done;\
+      fi;\
+    done < pyproject.toml
+
 
 .PHONY: setup
 setup:

docs/pyproject.toml

@@ -26,5 +26,5 @@ scylla-driver = { path = "../", develop = true }
 
 
 [build-system]
-requires = ["poetry>=1.8.0"]
+requires = ["poetry==2.2.0"]
 build-backend = "poetry.masonry.api"