CI: add py38 slow build pandas-dev#35160

Author: fangchenli

.travis.yml

@@ -43,6 +43,12 @@ matrix:
     - env:
         - JOB="3.8" ENV_FILE="ci/deps/travis-38.yaml" PATTERN="(not slow and not network and not clipboard)"
 
+    - env:
+      - JOB="3.8, slow" ENV_FILE="ci/deps/travis-38-slow.yaml" PATTERN="slow" SQL="1"
+      services:
+        - mysql
+        - postgresql
+
     - env:
         - JOB="3.7" ENV_FILE="ci/deps/travis-37.yaml" PATTERN="(not slow and not network and not clipboard)"
 

ci/deps/travis-38-slow.yaml

@@ -0,0 +1,37 @@
+name: pandas-dev
+channels:
+  - defaults
+  - conda-forge
+dependencies:
+  - python=3.8.*
+
+  # tools
+  - cython>=0.29.21
+  - pytest>=5.0.1
+  - pytest-xdist>=1.21
+  - hypothesis>=3.58.0
+
+  # pandas dependencies
+  - beautifulsoup4
+  - fsspec>=0.7.4
+  - html5lib
+  - lxml
+  - matplotlib
+  - numexpr
+  - numpy
+  - openpyxl
+  - patsy
+  - psycopg2
+  - pymysql
+  - pytables
+  - python-dateutil
+  - pytz
+  - s3fs>=0.4.0
+  - moto>=1.3.14
+  - scipy
+  - sqlalchemy
+  - xlrd
+  - xlsxwriter
+  - xlwt
+  - moto
+  - flask