Fix GitHub actions for Ocaml5 specific tests

Co-authored-by: Puneeth Chaganti <punchagan@muse-amuse.in>

.github/workflows/main.yml

@@ -5,11 +5,12 @@ on:
   push:
     branches:
       - main
+      - add-eio-backend
 
 jobs:
   build:
     strategy:
-      fail-fast: true
+      fail-fast: false
       matrix:
         os:
           - ubuntu-latest
@@ -47,14 +48,14 @@ jobs:
           opam install pbrt -y
 
       # We cannot install packages that need eio on ocaml versions before 5
-      - if: ${{ ! startsWith("5" matrix.ocaml-compiler) }}
-        run: |
-          packages=$(ls *.opam | grep -v eio)
+      - run: |
+          packages=$(ls ./*.opam | grep -v eio)
           opam install $packages --deps-only --with-test --solver=mccs
+        if: ${{ ! (startsWith(matrix.ocaml-compiler, '5')) }}
 
       # We should be able to install all packages on ocaml 5
-      - if: ${{ startsWith("5" matrix.ocaml-compiler) }}
-        run: opam install . --deps-only --with-test --solver=mccs
+      - run: opam install . --deps-only --with-test --solver=mccs
+        if: ${{ startsWith(matrix.ocaml-compiler, '5') }}
 
       - run: opam exec -- dune build @install -p opentelemetry,opentelemetry-lwt,opentelemetry-client-ocurl,opentelemetry-cohttp-lwt,opentelemetry-client-cohttp-lwt
 

src/client-cohttp-eio/dune

@@ -2,6 +2,8 @@
  (name opentelemetry_client_cohttp_eio)
  (public_name opentelemetry-client-cohttp-eio)
  (synopsis "Opentelemetry collector using cohttp+eio+unix")
+ (enabled_if
+  (>= %{ocaml_version} 5.0))
  (libraries
   opentelemetry
   opentelemetry.client

tests/bin/dune

@@ -25,6 +25,8 @@
  (modules emit1_eio)
  (preprocess
   (pps lwt_ppx))
+ (enabled_if
+  (>= %{ocaml_version} 5.0))
  (libraries
   unix
   logs

tests/client_e2e/dune

@@ -31,6 +31,8 @@
  (names test_cottp_lwt_client_e2e)
  (modules test_cottp_lwt_client_e2e)
  (package opentelemetry-client-cohttp-lwt)
+ (enabled_if
+  (>= %{ocaml_version} 5.0))
  (deps %{bin:emit1_cohttp} %{bin:emit1_eio})
  (libraries clients_e2e_lib alcotest opentelemetry opentelemetry.client))
 
@@ -39,6 +41,8 @@
  (modules test_cottp_eio_client_e2e)
  (package opentelemetry-client-cohttp-eio)
  (deps %{bin:emit1_eio})
+ (enabled_if
+  (>= %{ocaml_version} 5.0))
  (libraries clients_e2e_lib alcotest opentelemetry opentelemetry.client))
 
 (executable