Use uv instead of python venv

Signed-off-by: Nikolai Røed Kristiansen <nikolai.kristiansen@remarkable.no>

Author: nikolaik

action.yml

@@ -21,6 +21,7 @@ runs:
   using: composite
   steps:
     - uses: sigstore/cosign-installer@dc72c7d5c4d10cd6bcb8cf6e3fd625a9e5e537da # v3.7.0
+    - uses: astral-sh/setup-uv@f94ec6bedd8674c4426838e6b50417d36b6ab231 # v5.3.1
     - run: |
         cd $GITHUB_ACTION_PATH \
         && ./ct.sh \

ct.sh

@@ -96,7 +96,7 @@ install_chart_testing() {
         CT_SIG=https://github.com/helm/chart-testing/releases/download/v$version/chart-testing_${version#v}_linux_$arch.tar.gz.sig
 
         curl --retry 5 --retry-delay 1 -sSLo ct.tar.gz "https://github.com/helm/chart-testing/releases/download/v$version/chart-testing_${version#v}_linux_$arch.tar.gz"
-        cosign verify-blob --certificate $CT_CERT --signature $CT_SIG \
+        cosign verify-blob --certificate "$CT_CERT" --signature "$CT_SIG" \
           --certificate-identity "https://github.com/helm/chart-testing/.github/workflows/release.yaml@refs/heads/main" \
           --certificate-oidc-issuer "https://token.actions.githubusercontent.com" ct.tar.gz
         retVal=$?
@@ -109,17 +109,15 @@ install_chart_testing() {
         rm -f ct.tar.gz
 
         echo 'Creating virtual Python environment...'
-        python3 -m venv "${venv_dir}"
-
-        echo 'Activating virtual environment...'
-        # shellcheck disable=SC1090
-        source "${venv_dir}/bin/activate"
+        export UV_LINK_MODE=copy
+        uv venv "${venv_dir}"
+        export VIRTUAL_ENV="${venv_dir}"
 
         echo 'Installing yamllint...'
-        pip3 install "yamllint==${yamllint_version}"
+        uv pip install "yamllint==${yamllint_version}"
 
         echo 'Installing Yamale...'
-        pip3 install "yamale==${yamale_version}"
+        uv pip install "yamale==${yamale_version}"
     fi
 
     # https://github.com/helm/chart-testing-action/issues/62