Use SublimeText/syntax-test-action for CI

.github/workflows/ci.yaml

@@ -1,49 +1,29 @@
-name: CI
+name: Syntax Tests
+
 on:
   push:
-    branches:
-      - '*'
-    tags-ignore:
-      - '*'
+    paths:
+      - '**.sublime-syntax'
+      - '**/syntax_test*'
+      - '**.tmPreferences'
   pull_request:
-    branches:
-      - '*'
+    paths:
+      - '**.sublime-syntax'
+      - '**/syntax_test*'
+      - '**.tmPreferences'
 
 jobs:
-  build:
-    name: Run syntax_tests (${{ matrix.st.name }})
+  syntax_tests:
+    name: Syntax Tests (${{ matrix.build }})
     runs-on: ubuntu-latest
+    timeout-minutes: 15  # default is 6 hours!
     strategy:
       matrix:
-        st:
-          - name: Latest Sublime Text
-            url: https://download.sublimetext.com/latest/dev/linux/x64/syntax_tests
-            test_directory: st_syntax_tests
-          - name: Sublime Text 3
-            url: https://download.sublimetext.com/st3_syntax_tests_build_3211_x64.tar.bz2
-            test_directory: st3_syntax_tests
+        include:
+          - build: latest  # Latest dev build
+          - build: 4169  # Oldest stable version we intent to support
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v3
+      - uses: SublimeText/syntax-test-action@v2
         with:
-          path: Terraform
-
-      - name: Download syntax_tests
-        run: wget -O ${{ matrix.st.test_directory }}.tar.xz ${{ matrix.st.url }}
-
-      - name: Extract syntax_tests
-        run: tar xf ${{ matrix.st.test_directory }}.tar.xz
-
-      - name: Setup package directory
-        run: mkdir -p ./${{ matrix.st.test_directory }}/Data/Packages
-
-      - name: Move package files to Packages dir
-        run: mv Terraform ./${{ matrix.st.test_directory }}/Data/Packages/
-
-      - name: Move syntax_tests
-        run: mv ${{ matrix.st.test_directory }}/* ./
-
-      - name: Cleanup syntax_tests archive
-        run: rm -R ${{ matrix.st.test_directory }} ${{ matrix.st.test_directory }}.tar.xz
-
-      - name: Run syntax tests
-        run: ./syntax_tests
+          build: ${{ matrix.build }}