Add pytest dependency

.gitlab-ci.yml

@@ -22,6 +22,7 @@ stages:
     image: mroynard/ubuntu-toolset:stable
     script:
         - set -e
+        - pip install pytest
         - conan create
               --build missing
               -pr $CONAN_PROFILE
@@ -86,6 +87,7 @@ distcheck-package-linux-bintray:
     image: mroynard/ubuntu-toolset:stable
     script:
         - set -e
+        - pip install pytest
         - conan remote add $CONAN_BINTRAY_REMOTE_NAME $CONAN_BINTRAY_REMOTE_URL
         - conan user
                -p $CONAN_BINTRAY_API_KEY
@@ -106,6 +108,7 @@ distcheck-package-linux-lrde:
     image: mroynard/ubuntu-toolset:stable
     script:
         - set -e
+        - pip install pytest
         - conan remote add $CONAN_LRDE_REMOTE_NAME $CONAN_LRDE_REMOTE_URL
         - conan user
                -p $CONAN_LRDE_API_KEY