Use Fooman-mirror for Travis installation to avoid requiring credentials (see https://fooman.com/blog/no-authentication-needed-magento-2-mirror.html and #51)

Author: fnogatz

Diff for: .travis.yml

@@ -12,6 +12,10 @@ jobs:
       env: M2_VERSION=2.3.6-p1
     - php: 7.3
       env: M2_VERSION=2.3.5
+    - php: 7.3
+      env: M2_VERSION=2.3.4
+    - php: 7.3
+      env: M2_VERSION=2.3.3
 cache:
   directories:
     - $HOME/.composer/cache

Diff for: dev/ci/build.sh

@@ -18,9 +18,7 @@ fi
 for envkey in \
   MODULE_NAME \
   MODULE_SRC_DIR \
-  M2_VERSION \
-  M2_REPO_USERNAME \
-  M2_REPO_PASSWORD
+  M2_VERSION
 do
   if [ -z "$(eval echo \$$envkey)" ]
   then
@@ -40,17 +38,13 @@ then
   MODULE_DST_DIR="$BUILD_DIR/app/code/$(echo $MODULE_NAME | sed 's/_/\//')"
 fi
 
-# Set composer authentication params
-"$COMPOSER_BIN" config --global \
-  "http-basic.repo.magento.com" "$M2_REPO_USERNAME" "$M2_REPO_PASSWORD"
-
 set -x
 
 # Fetch Magento 2 source
 "$COMPOSER_BIN" create-project \
   --quiet \
   --ignore-platform-reqs \
-  --repository-url=https://repo.magento.com/ \
+  --repository-url=https://repo-magento-mirror.fooman.co.nz/ \
   magento/project-community-edition \
   "$BUILD_DIR" "$M2_VERSION"