⚙️ Parallel builds

.travis.yml

@@ -1,6 +1,12 @@
 sudo: required
 language: python
 
+env:
+  - BUILD=release
+  - BUILD=prerelease
+  - BUILD=branches
+  - BUILD=special
+
 git:
   depth: 5
 

build-all.sh

@@ -1,5 +1,14 @@
 #!/bin/bash
 # Builds all Docker images this project provides
+# Arguments:
+#   BUILD:     The release to build.
+#              Allowed: release, prerelease, branches, special
+#              Default: undefined
+
+ALL_BUILDS=("release" "prerelease" "branches" "special")
+BUILDS=("${BUILD:-"${ALL_BUILDS[@]}"}")
+
+echo "⚙️ Configured builds: ${BUILDS[*]}"
 
 VARIANTS=("" "ldap")
 
@@ -35,23 +44,40 @@ if [ ! -z "${DEBUG}" ] || \
       fi
     fi
 
-    echo "🛠 Building '$DOCKERFILE'"
-
+    for BUILD in "${BUILDS[@]}"; do
+      echo "🛠 Building '$BUILD' from '$DOCKERFILE'"
+      case $BUILD in
+        release)
           # build the latest release
           # shellcheck disable=SC2068
           ./build-latest.sh $@ || ERROR=1
-
+          ;;
+        prerelease)
           # build the latest pre-release
           # shellcheck disable=SC2068
       		PRERELEASE=true ./build-latest.sh $@ || ERROR=1
-
+          ;;
+        branches)
           # build all branches
           # shellcheck disable=SC2068
       		./build-branches.sh $@ || ERROR=1
-
+          ;;
+        special)
           # special build
           # shellcheck disable=SC2068
       		SRC_ORG=lampwins TAG=webhooks-backend ./build.sh "feature/webhooks-backend" $@ || ERROR=1
+          ;;
+        *)
+          echo "🚨 Unrecognized build '$BUILD'."
+
+          if [ -z "$DEBUG" ]; then
+            exit 1
+          else
+            echo "⚠️ Would exit here with code '1', but DEBUG is enabled."
+          fi
+          ;;
+      esac
+    done
   done
 else
   echo "❎ Not building anything."