fix: more reliable retrieve url for Syft

closes #65

Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>
Co-authored-by: Clément Bois <clement.bois@orange.com>

templates/gitlab-ci-python.yml

@@ -1061,7 +1061,8 @@ py-sbom:
       if [[ -z "$PYTHON_SBOM_SYFT_URL" ]]
       then
         log_info "Syft version unset: retrieve latest version..."
-        PYTHON_SBOM_SYFT_URL="https://github.com$(curl https://github.com/anchore/syft/releases -s | sed -rn 's/.*href="(.*_linux_amd64\.tar\.gz)".*/\1/p')"
+        syft_version=$(curl -Ls -o /dev/null -w %{url_effective} https://github.com/anchore/syft/releases/latest | grep -o '[^/v]*$')
+        PYTHON_SBOM_SYFT_URL="https://github.com/anchore/syft/releases/download/v${syft_version}/syft_${syft_version}_linux_amd64.tar.gz"
         log_info "... use latest Syft version: \\e[32m$PYTHON_SBOM_SYFT_URL\\e[0m"
       fi
       python_sbom_syft="$PIP_CACHE_DIR/syft-$(echo "$PYTHON_SBOM_SYFT_URL" | md5sum | cut -d" " -f1)"