Add action

.github/workflows/test.yml

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+name: Test action
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+        - name: Checkout repo
+          uses: actions/checkout@v3
+        - name: Build Dockerfile
+          run: docker build . --file Dockerfile
+        - name: Create custom test script
+          run: |
+            mkdir test-scripts
+            printf 'test "github actions":\nassert true is true with "it worked!"' > test-scripts/actions.sk
+        - name: Run skript-test-action
+          uses: ./
+          with:
+            test-script-directory: test-scripts

skript-test-acton/Dockerfile

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+FROM alpine:3.19.1
+LABEL authors="SkriptLang"
+
+RUN apk add --no-cache git
+COPY run-tests.sh /run-tests.sh
+
+ENTRYPOINT ["/run-tests.sh"]

skript-test-acton/action.yml

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+name: 'Skript Tests'
+description: 'Runs Skript tests'
+inputs:
+  test-script-directory:
+    description: 'The directory containing the tests to run'
+    required: true
+  skript-repo-ref:
+    description: 'The Git reference of the Skript version to test with (this can be a commit sha, branch, tag, etc.)'
+    required: false
+  run-vanilla-tests:
+    description: 'Controls whether or not the vanilla Skript tests are run. It is recommended you keep this on to ensure your addon doesn''t change vanilla behavior'
+    required: false
+    default: 'true'
+
+outputs:
+  passed:
+    description: 'Whether or not the tests passed'
+
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - ${{ inputs.test-script-directory }}
+    - ${{ inputs.skript-repo-ref }}
+    - ${{ inputs.run-vanilla-tests }}

skript-test-acton/run-tests.sh

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+#!/bin/sh -l
+
+test_script_directory="$1"
+skript_repo_ref="$2"
+run_vanilla_tests="$3"
+skript_test_directory="src/test/skript/tests"
+
+git clone --recurse-submodules https://github.com/SkriptLang/Skript.git
+cd Skript || exit 1
+if [ -n "$skript_repo_ref" ]; then
+  git checkout -f "$skript_repo_ref"
+fi
+if [ "$run_vanilla_tests" = "false" ]; then
+  rm -rf "${skript_test_directory:?}/*"
+fi
+cp "/github/workspace/$test_script_directory" "${skript_test_directory:?}/custom"
+./gradlew quickTest