Use uv in CI (#1013)

The CI takes a really long time to run sometimes:

<img width="1390" alt="image"
src="https://github.com/astronomer/astronomer-cosmos/assets/31971762/87d33704-6033-49ff-a7b0-aa91af1737cc">

Seems to run a a little bit faster (shaves about 30 seconds off each run), but Hatch (not uv) is still getting stuck on resolving the Airflow 2.7 dependencies.

.github/workflows/test.yml

@@ -76,7 +76,8 @@ jobs:
 
       - name: Install packages and dependencies
         run: |
-          python -m pip install hatch
+          python -m pip install uv
+          uv pip install --system hatch
           hatch -e tests.py${{ matrix.python-version }}-${{ matrix.airflow-version }} run pip freeze
 
       - name: Test Cosmos against Airflow ${{ matrix.airflow-version }} and Python ${{ matrix.python-version }}
@@ -129,7 +130,8 @@ jobs:
 
       - name: Install packages and dependencies
         run: |
-          python -m pip install hatch
+          python -m pip install uv
+          uv pip install --system hatch
           hatch -e tests.py${{ matrix.python-version }}-${{ matrix.airflow-version }} run pip freeze
 
       - name: Test Cosmos against Airflow ${{ matrix.airflow-version }} and Python ${{ matrix.python-version }}
@@ -198,7 +200,8 @@ jobs:
 
       - name: Install packages and dependencies
         run: |
-          python -m pip install hatch
+          python -m pip install uv
+          uv pip install --system hatch
           hatch -e tests.py${{ matrix.python-version }}-${{ matrix.airflow-version }} run pip freeze
 
       - name: Test Cosmos against Airflow ${{ matrix.airflow-version }} and Python ${{ matrix.python-version }}
@@ -259,7 +262,8 @@ jobs:
 
       - name: Install packages and dependencies
         run: |
-          python -m pip install hatch
+          python -m pip install uv
+          uv pip install --system hatch
           hatch -e tests.py${{ matrix.python-version }}-${{ matrix.airflow-version }} run pip freeze
 
       - name: Test Cosmos against Airflow ${{ matrix.airflow-version }} and Python ${{ matrix.python-version }}
@@ -332,7 +336,8 @@ jobs:
 
       - name: Install packages and dependencies
         run: |
-          python -m pip install hatch
+          python -m pip install uv
+          uv pip install --system hatch
           hatch -e tests.py${{ matrix.python-version }}-${{ matrix.airflow-version }} run pip freeze
 
       - name: Test Cosmos against Airflow ${{ matrix.airflow-version }}, Python ${{ matrix.python-version }} and dbt 1.5.4
@@ -404,7 +409,8 @@ jobs:
 
       - name: Install packages and dependencies
         run: |
-          python -m pip install hatch
+          python -m pip install uv
+          uv pip install --system hatch
           hatch -e tests.py${{ matrix.python-version }}-${{ matrix.airflow-version }} run pip freeze
 
       - name: Run performance tests against against Airflow ${{ matrix.airflow-version }} and Python ${{ matrix.python-version }}

scripts/test/pre-install-airflow.sh

@@ -3,12 +3,23 @@
 AIRFLOW_VERSION="$1"
 PYTHON_VERSION="$2"
 
+# Use this to set the appropriate Python environment in Github Actions,
+# while also not assuming --system when running locally.
+if [ "$GITHUB_ACTIONS" = "true" ] && [ -z "${VIRTUAL_ENV}" ]; then
+  py_path=$(which python)
+  virtual_env_dir=$(dirname "$(dirname "$py_path")")
+  export VIRTUAL_ENV="$virtual_env_dir"
+fi
+
+echo "${VIRTUAL_ENV}"
+
 CONSTRAINT_URL="https://raw.githubusercontent.com/apache/airflow/constraints-$AIRFLOW_VERSION.0/constraints-$PYTHON_VERSION.txt"
 curl -sSL $CONSTRAINT_URL -o /tmp/constraint.txt
 # Workaround to remove PyYAML constraint that will work on both Linux and MacOS
 sed '/PyYAML==/d' /tmp/constraint.txt > /tmp/constraint.txt.tmp
 mv /tmp/constraint.txt.tmp /tmp/constraint.txt
 # Install Airflow with constraints
-pip install apache-airflow==$AIRFLOW_VERSION --constraint /tmp/constraint.txt
-pip install pydantic --constraint /tmp/constraint.txt
+pip install uv
+uv pip install "apache-airflow==$AIRFLOW_VERSION" --constraint /tmp/constraint.txt
+uv pip install pydantic --constraint /tmp/constraint.txt
 rm /tmp/constraint.txt