Add images for latest stable Python version (3.10) to the build flow. (#54)

Update `latest` tag on Python and Django images.

.gitlab-ci.yml

@@ -58,11 +58,21 @@ python-3.9-alpine:
   variables:
     IMAGE_TYPE: python-alpine
     IMAGE_NAME: python
-    TAGS: 3.9-alpine alpine latest
+    TAGS: 3.9-alpine alpine
     PYTHON_VERSION: "3.9"
     REQUIREMENTS: base
     ENVSUBST_DOCKERFILE: "True"
 
+python-3.10-alpine:
+  extends: .build_and_push
+  variables:
+    IMAGE_TYPE: python-alpine
+    IMAGE_NAME: python
+    TAGS: 3.10-alpine alpine latest
+    PYTHON_VERSION: "3.10"
+    REQUIREMENTS: base
+    ENVSUBST_DOCKERFILE: "True"
+
 python-3.7-slim:
   extends: .build_and_push
   variables:
@@ -91,6 +101,15 @@ python-3.9-slim:
     PYTHON_VERSION: "3.9"
     ENVSUBST_DOCKERFILE: "True"
 
+python-3.10-slim:
+  extends: .build_and_push
+  variables:
+    IMAGE_TYPE: python-slim
+    IMAGE_NAME: python
+    TAGS: 3.10-slim slim latest
+    PYTHON_VERSION: "3.10"
+    ENVSUBST_DOCKERFILE: "True"
+
 django-2.1-python-3.7-alpine:
   extends: .build_and_push
   variables:
@@ -164,6 +183,16 @@ django-3.2-python-3.9-alpine:
     REQUIREMENTS: django-3.2
     ENVSUBST_DOCKERFILE: "True"
 
+django-3.2-python-3.10-alpine:
+  extends: .build_and_push
+  variables:
+    IMAGE_TYPE: python-alpine
+    IMAGE_NAME: django
+    TAGS: 3.2 3.2-py3.10 3.2-py3.10-alpine 3.2-alpine latest
+    PYTHON_VERSION: "3.10"
+    REQUIREMENTS: django-3.2
+    ENVSUBST_DOCKERFILE: "True"
+
 
 ansible-2.8:
   extends: .build_and_push