Make TravisCI auto-build Linux executables.

.travis.yml

@@ -14,11 +14,15 @@ script:
   - mkdir deploy
   # Windows .exe
   - docker pull koalaman/winghc
-  - docker run -v "$PWD:/appdata" koalaman/winghc cuib
+  - docker run --user="$UID" --rm -v "$PWD:/appdata" koalaman/winghc cuib
   - cp "dist/build/ShellCheck/shellcheck.exe" "deploy/shellcheck-$TAG.exe"
-  # Linux Docker
-  - docker build -t builder -f Dockerfile_builder .
-  - docker run --rm -it -v "$(pwd):/mnt" builder
+  - rm -rf dist || true
+  # Linux static executable
+  - docker pull koalaman/scbuilder
+  - docker run --user="$UID" --rm -v "$PWD:/mnt" koalaman/scbuilder
+  - cp "shellcheck" "deploy/shellcheck-$TAG.linux"
+  - rm -rf dist || true
+  # Linux Docker image
   - docker build -t "$DOCKER_REPO:$TAG" .
 
 after_success:
@@ -28,10 +32,11 @@ after_success:
     ([ "$TRAVIS_BRANCH" == "master" ] || [ -n "$TRAVIS_TAG" ]) && docker push "$DOCKER_REPO:$TAG"
 
 after_failure:
+  - id
   - pwd
   - df -h
   - find . -name '*.log' -type f -exec grep "" /dev/null {} +
-  - find .
+  - find . -ls
 
 deploy:
   provider: gcs