Merge branch '1.8'

* 1.8:
  [CI] Switch documentation build from Travis to GitHub Actions

.github/workflows/documentation.yml

@@ -0,0 +1,30 @@
+name: Documentation
+
+on:
+    push:
+        paths:
+            - "docs/**"
+    pull_request:
+        paths:
+            - "docs/**"
+    release:
+        types: [created]
+    schedule:
+        -
+            cron: "0 1 * * 6" # Run at 1am every Saturday
+
+jobs:
+    tests:
+        runs-on: ubuntu-latest
+        name: "Build"
+        steps:
+            -
+                uses: actions/checkout@v2
+
+            -
+                name: Install documentation dependencies
+                run: docker build -t sylius-docs docs
+
+            -
+                name: Build the documentation
+                run: docker run --rm sylius-docs

.travis.yml

@@ -29,10 +29,9 @@ jobs:
         -   
             php: 7.3
             env:
-                - SYLIUS_SUITE="docs packages"
+                - SYLIUS_SUITE="packages"
                 - SYMFONY_VERSION="4.4.*"
             services:
-                - docker
                 - mysql
             addons:
                 apt:

docs/build.sh

@@ -6,9 +6,9 @@ code=0
 
 sphinx-build -nWT . build || code=$?
 # Flags used here
-#  -n   Run in nit-picky mode. Currently, this generates warnings for all missing references.
-#  -W   Turn warnings into errors. This means that the build stops at the first warning and sphinx-build exits with exit status 1.
-#  -T   Displays the full stack trace if an unhandled exception occurs.
+#  -n Run in nit-picky mode. Currently, this generates warnings for all missing references.
+#  -W Turn warnings into errors. This means that the build stops at the first warning and sphinx-build exits with exit status 1.
+#  -T Displays the full stack trace if an unhandled exception occurs.
 
 if [[ ${code} != 0 ]]; then
     (>&2 echo "Build failed, rerunning to show all the warnings and errors")