ci: add scala lifter compilation

.github/workflows/test.yml

@@ -60,7 +60,7 @@ jobs:
     - run: dune build @offline-coverage -j4
 
   offline-cpp:
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-24.04  # for recent llvm version
 
     steps:
     - uses: actions/checkout@v4
@@ -81,3 +81,25 @@ jobs:
 
     - name: 'syntax check generated C++ lifter'
       run: meson compile -C offlineASL-cpp/build
+
+  offline-scala:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - uses: cachix/install-nix-action@v25
+    - run: echo 'preparing nix shell environment'
+
+    - uses: coursier/cache-action@v6
+    - uses: coursier/setup-action@v1
+      with:
+        jvm: adoptium:1.17
+        apps: mill
+
+    - run: dune build --profile release
+    - run: mkdir -p offlineASL-scala/lifter/src/generated
+    - run: echo ':gen A64 .* scala true offlineASL-scala/lifter/src/generated' | OCAMLRUNPARAM=b dune exec asli
+
+    - run: 'cd offlineASL-scala && mill lifter.assembly'
+    - run: 'cd offlineASL-scala && mill main.run --help'

offlineASL-scala/readme.md

@@ -1,9 +1,13 @@
-Build standalone Scala lifter interface
+Build standalone Scala lifter interface.
 
+Requires Mill (e.g. installed by Coursier). Run in parent directory:
+```bash
+mkdir -p offlineASL-scala/lifter/src/generated
+echo ':gen A64 aarch64.+ scala true offlineASL-scala/lifter/src/generated' | dune exec asli
+cd offlineASL-scala
+mill lifter.assembly
+mill main.run --opcode 0x8b031041
 ```
-# (in parent direictory)
-~ echo ':gen A64 aarch64.+ scala true scalaOfflineASL/lifter/generated' | dune exec asli
-~ cd scalaOfflineASL
-~ ./mill lifter.assembly
-~ ./mill main.run
-```
+This should compile successfully. However, the last command will fail since
+the default instruction-building interface simply throws "not implemented"
+on all methods.