build: use python 3.10 for :latest and :release-candidate images (#52)

Contributes to https://github.ibm.com/st4sd/st4sd-runtime-core/issues/171

Signed-off-by: Vassilis Vassiliadis <[email protected]>

.travis.yml

@@ -19,6 +19,7 @@ before_script:
 
 jobs:
   include:
+    # VV: TODO Get rid of the python 3.7 image
     - stage: image
       services:
         - docker
@@ -56,9 +57,9 @@ jobs:
     #  os: linux-ppc64le
     - stage: multiarch
       os: linux
-      python: "3.7"
+      python: "3.10"
       env:
-      - BUILD_PYTHON_VERSION=37
+      - BUILD_PYTHON_VERSION=310
       script:
         - export SRC_TAG_X8664="py${BUILD_PYTHON_VERSION}-latest-x86_64"
         - export DST_TAG_X8664="py${BUILD_PYTHON_VERSION}-x86_64"
@@ -68,11 +69,12 @@ jobs:
         - export LABEL="latest"
         - ./deploy/build_multiarch.sh
 
+    # VV: TODO Get rid of python 3.7 image
     - stage: multiarch
       os: linux
-      python: "3.10"
+      python: "3.7"
       env:
-      - BUILD_PYTHON_VERSION=310
+      - BUILD_PYTHON_VERSION=37
       script:
         - export SRC_TAG_X8664="py${BUILD_PYTHON_VERSION}-latest-x86_64"
         - export DST_TAG_X8664="py${BUILD_PYTHON_VERSION}-x86_64"