feat: build docker base image from travis ci

This will ensure staying up to date and should add some transparency how these images are made.

.travis.yml

@@ -0,0 +1,19 @@
+---
+language: bash
+services:
+  - docker
+env:
+  global:
+    - DOCKER_IMAGE=bycedric/expo-cli
+    - DOCKER_TAG=2
+script:
+  - docker build base -t $DOCKER_IMAGE:$DOCKER_TAG
+  - docker run -ti --rm $DOCKER_IMAGE:$DOCKER_TAG diagnostics
+before_deploy:
+  - echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
+  - docker tag $DOCKER_IMAGE:$DOCKER_TAG $DOCKER_IMAGE:latest
+deploy:
+  provider: script
+  script: docker push $DOCKER_IMAGE:$DOCKER_TAG && docker push $DOCKER_IMAGE:latest
+  on:
+    branch: master

Dockerfile

@@ -1,4 +1,4 @@
-FROM bycedric/ci-expo:2
+FROM bycedric/expo-cli:2
 
 LABEL com.github.actions.name="Expo CLI"
 LABEL com.github.actions.description="Use any Expo CLI command in your GitHub Actions workflow."