Add a CI job for our MSRV

.builds/1.43.0.yml

@@ -0,0 +1,61 @@
+image: archlinux
+packages:
+  - rustup
+sources:
+  - https://github.com/ruma/ruma
+tasks:
+  - rustup: |
+      # We specify --profile minimal because we'd otherwise download docs
+      rustup toolchain install 1.43.0 --profile minimal -c rustfmt -c clippy
+      rustup default 1.43.0
+  - test: |
+      cd ruma
+
+      # We don't want the build to stop on individual failure of independent
+      # tools, so capture tool exit codes and set the task exit code manually
+      set +e
+
+      # We don't want to try building ruma-signatures on 1.43.0, since it
+      # depends on ring (MSRV 'stable') and is exempt from our MSRV policy.
+      # Instead, enable all other dependencies on the ruma crate and try
+      # building that (usually you would enable the higher-level features, but
+      # we're only doing this to have all relevant crates compiled, no to build
+      # a useful crate).
+      pushd ruma
+
+      cargo build \
+        --features ruma-events,ruma-api,ruma-appservice-api,ruma-client-api,ruma-federation-api,ruma-identity-service-api,ruma-push-gateway-api \
+        --quiet
+      ruma_build_exit=$?
+
+      # ruma-client isn't re-exported by ruma right now, so it needs to be built
+      # separately
+      pushd ruma-client
+
+      cargo build --quiet
+      client_build_exit=$?
+
+      popd
+
+      # ruma-identifiers has a bunch of features. Make sure it works both with
+      # all of them and none of them being enabled.
+      pushd ruma-identifiers
+
+      cargo build --no-default-features --quiet
+      id_build_1_exit=$?
+
+      cargo build --all-features --quiet
+      id_build_2_exit=$?
+
+      popd
+
+      # ruma-client_api also has a few optional features, but none are enabled
+      # by default. Make sure it works with all of them.
+      pushd ruma-client-api
+
+      cargo build --all-features --verbose
+      client_api_build_exit=$?
+
+      popd
+
+      exit $(( $ruma_build_exit || $client_build_exit || $id_build_1_exit || $id_build_2_exit || $client_api_build_exit ))