ci(kitchen+travis): modify matrix to include develop platform

* Use balanced matrix based on `template-formula` guidelines
* Initial ref: saltstack-formulas/template-formula#118

Author: myii

.travis.yml

@@ -11,29 +11,33 @@ language: ruby
 services:
   - docker
 
-before_install:
-  - bundle install
-
 # Make sure the instances listed below match up with
 # the `platforms` defined in `kitchen.yml`
 env:
   matrix:
-    - INSTANCE: default-debian-9-2019-2-py3
+    - INSTANCE: default-debian-9-develop-py3
+    # TODO: Re-enable this once the `systemd` service can be restarted reliably
+    # - INSTANCE: default-ubuntu-1804-develop-py3
+    # - INSTANCE: default-centos-7-develop-py3
+    # - INSTANCE: default-fedora-29-develop-py3
+    # - INSTANCE: default-opensuse-leap-15-develop-py3
+    # - INSTANCE: default-debian-9-2019-2-py3
     # TODO: Re-enable this once the `systemd` service can be restarted reliably
     # - INSTANCE: default-ubuntu-1804-2019-2-py3
     - INSTANCE: default-centos-7-2019-2-py3
-    # - INSTANCE: default-fedora-29-2019-2-py3
-    - INSTANCE: default-opensuse-leap-15-2019-2-py3
+    - INSTANCE: default-fedora-29-2019-2-py3
+    # - INSTANCE: default-opensuse-leap-15-2019-2-py3
     # - INSTANCE: default-debian-9-2018-3-py2
     - INSTANCE: default-ubuntu-1604-2018-3-py2
     # - INSTANCE: default-centos-7-2018-3-py2
-    - INSTANCE: default-fedora-29-2018-3-py2
-    # TODO: Use this when fixed instead of `opensuse-423`
-    # NOTE: Having to temporarily disable `opensuse-423` due to slow mirror
+    # - INSTANCE: default-fedora-29-2018-3-py2
+    # TODO: Use this when fixed instead of `opensuse-leap-42`
+    # Ref: https://github.com/netmanagers/salt-image-builder/issues/2
     # - INSTANCE: default-opensuse-leap-15-2018-3-py2
-    # - INSTANCE: default-opensuse-423-2018-3-py2
+    - INSTANCE: default-opensuse-leap-42-2018-3-py2
     # - INSTANCE: default-debian-8-2017-7-py2
     # - INSTANCE: default-ubuntu-1604-2017-7-py2
+    # TODO: Enable after improving the formula to work with other than `systemd`
     - INSTANCE: default-centos-6-2017-7-py2
     # - INSTANCE: default-fedora-28-2017-7-py2
     # - INSTANCE: default-opensuse-leap-42-2017-7-py2
@@ -73,4 +77,3 @@ jobs:
         script:
           # Run `semantic-release`
           - npx semantic-release@15
-

Gemfile.lock

@@ -11,6 +11,41 @@ driver:
 # Make sure the platforms listed below match up with
 # the `env.matrix` instances defined in `.travis.yml`
 platforms:
+  ## SALT `develop`
+  - name: debian-9-develop-py3
+    driver:
+      image: netmanagers/salt-develop-py3:debian-9
+      provision_command:
+        - apt-get update && apt-get install -y python3-pip
+        - curl -o bootstrap-salt.sh -L https://bootstrap.saltstack.com
+        - sh bootstrap-salt.sh -XdPbfrq -x python3 git develop
+  - name: ubuntu-1804-develop-py3
+    driver:
+      image: netmanagers/salt-develop-py3:ubuntu-18.04
+      provision_command:
+        - apt-get update && apt-get install -y python3-pip
+        - curl -o bootstrap-salt.sh -L https://bootstrap.saltstack.com
+        - sh bootstrap-salt.sh -XdPbfrq -x python3 git develop
+  - name: centos-7-develop-py3
+    driver:
+      image: netmanagers/salt-develop-py3:centos-7
+      provision_command:
+        - curl -o bootstrap-salt.sh -L https://bootstrap.saltstack.com
+        - sh bootstrap-salt.sh -XdPbfrq -x python3 git develop
+  - name: fedora-29-develop-py3
+    driver:
+      image: netmanagers/salt-develop-py3:fedora-29
+      provision_command:
+        - curl -o bootstrap-salt.sh -L https://bootstrap.saltstack.com
+        - sh bootstrap-salt.sh -XdPbfrq -x python3 git develop
+  - name: opensuse-leap-15-develop-py3
+    driver:
+      image: netmanagers/salt-develop-py3:opensuse-leap-15
+      provision_command:
+        - curl -o bootstrap-salt.sh -L https://bootstrap.saltstack.com
+        - sh bootstrap-salt.sh -XdPbfrq -x python3 git develop
+      run_command: /usr/lib/systemd/systemd
+
   ## SALT 2019.2
   - name: debian-9-2019-2-py3
     driver:
@@ -42,16 +77,17 @@ platforms:
   - name: fedora-29-2018-3-py2
     driver:
       image: netmanagers/salt-2018.3-py2:fedora-29
-  # TODO: Use this when fixed instead of `opensuse-423`
-  - name: opensuse-leap-15-2018-3-py2
-    driver:
-      image: netmanagers/salt-2018.3-py2:opensuse-leap-15
-      run_command: /usr/lib/systemd/systemd
-  - name: opensuse-423-2018-3-py2
-    driver:
-      image: netmanagers/salt-2018.3-py2:opensuse-423
+  # TODO: Use this when fixed instead of `opensuse-leap-42`
+  # Ref: https://github.com/netmanagers/salt-image-builder/issues/2
+  # - name: opensuse-leap-15-2018-3-py2
+  #   driver:
+  #     image: netmanagers/salt-2018.3-py2:opensuse-leap-15
+  #     run_command: /usr/lib/systemd/systemd
+  - name: opensuse-leap-42-2018-3-py2
+    driver:
+      image: netmanagers/salt-2018.3-py2:opensuse-leap-42
       provision_command:
-        - zypper refresh && zypper install -y net-tools
+        - zypper refresh && zypper install -y python-pip
       run_command: /usr/lib/systemd/systemd
 
   ## SALT 2017.7