Fixup HQX build

Porting over few more improvements from #777 that can be applied to HQX despite the older Rust version:

 - Removed Cargo.lock from .gitignore (the file itself was added in the original PR, but is still ignored and wouldn't get committed on changes).
 - Removed couple of stray .DS_Store accidentally added in that PR.
 - Added a `--locked` to `wasm-pack` build to make sure we rebuild HQX with the same versions from Cargo.lock.
 - Removed separate `wasm-strip` and `wasm-opt -Os` steps from build.sh in HQX because they're already included in wasm-pack, and running twice only makes build slower.

codecs/hqx/.gitignore

@@ -1,5 +1 @@
-**/*.rs.bk
-target
-Cargo.lock
-bin/
-pkg/README.md
+/target

codecs/hqx/Dockerfile

@@ -7,8 +7,5 @@ RUN curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh
 RUN mkdir /opt/binaryen && \
  curl -L https://github.com/WebAssembly/binaryen/releases/download/1.38.32/binaryen-1.38.32-x86-linux.tar.gz  | tar -xzf - -C /opt/binaryen --strip 1
 
-RUN mkdir /opt/wabt && \
- curl -L https://github.com/WebAssembly/wabt/releases/download/1.0.11/wabt-1.0.11-linux.tar.gz  | tar -xzf - -C /opt/wabt --strip 1
-
-ENV PATH="/opt/binaryen:/opt/wabt:${PATH}"
+ENV PATH="/opt/binaryen:${PATH}"
 WORKDIR /src

codecs/hqx/build.sh

@@ -6,12 +6,8 @@ echo "============================================="
 echo "Compiling wasm"
 echo "============================================="
 (
-  wasm-pack build
-  wasm-strip pkg/squooshhqx_bg.wasm
-  echo "Optimising Wasm so it doesn't break Chrome (this takes like 10-15mins. get a cup of tea)"
-  echo "Once https://crbug.com/974804 is fixed, we can remove this step"
+  wasm-pack build -- --verbose --locked
   rm pkg/.gitignore
-  wasm-opt -Os --no-validation -o pkg/squooshhqx_bg.wasm pkg/squooshhqx_bg.wasm
 )
 echo "============================================="
 echo "Compiling wasm  done"

codecs/hqx/package.json

@@ -1,7 +1,7 @@
 {
   "name": "hqx",
   "scripts": {
-    "build:image": "docker build -t squoosh-hqx .",
+    "build:image": "docker build -t squoosh-hqx - < Dockerfile",
     "build": "docker run --rm -v $(pwd):/src squoosh-hqx ./build.sh"
   }
 }