Don't overwrite existing pipx or poetry.

Author: brunns

Makefile

@@ -43,8 +43,7 @@ _dist_include="pytest.ini poetry.lock poetry.toml pyproject.toml Makefile build/
 # Example CI/CD targets are: dependencies, build, publish, deploy, clean, etc.
 
 dependencies: # Install dependencies needed to build and test the project @Pipeline
-	pip install --user pipx
-	pipx install poetry
+	scripts/dependencies.sh
 
 build: # Build the project artefact @Pipeline
 	# TODO: Implement the artefact build step

scripts/dependencies.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+set -euo pipefail
+
+if ! [ -x "$(command -v poetry)" ]; then
+  if ! [ -x "$(command -v pipx)" ]; then
+    echo "installing pipx"
+    python -m pip install --user pipx --isolated
+    python -m pipx ensurepath
+  else
+    echo "pipx found"
+  fi
+  echo "installing poetry"
+  python -m pipx install poetry
+else
+  echo "poetry found"
+fi