Remove dune subst git hack after #1853

Author: OlivierNicole

bench.Dockerfile

@@ -10,16 +10,9 @@ RUN wget https://nodejs.org/dist/v22.14.0/node-v22.14.0-linux-x64.tar.xz && \
     tar xJvf node-v22.14.0-linux-x64.tar.xz && \
     sudo cp node-v22.14.0-linux-x64/bin/node /usr/bin/node
 COPY --chown=opam:opam ./*.opam ./VERSION ./
-RUN opam exec -- git init && \
-    opam exec -- git add . && \
-    opam exec -- git commit -m dummy && \
-    opam exec -- git tag -a $(cat VERSION)-dev -m dummy
 RUN opam pin -yn --with-version=dev .
 RUN opam install -y --deps-only js_of_ocaml-compiler && \
     opam install -y binaryen-bin
 COPY --chown=opam:opam . ./
-RUN opam exec -- git add . && \
-    opam exec -- git commit -m dummy && \
-    opam exec -- git tag -a $(cat VERSION)-dev-2 -m dummy
 RUN opam install -y wasm_of_ocaml-compiler
 WORKDIR ./benchmarks