add a readme

readme.md

@@ -0,0 +1,84 @@
+# Common CI workflow
+
+This goal of this repo is to define a single Github workflow which will be used
+in multiple Status projects which share the same common steps required
+for testing:
+- setting up the build matrix (different OSes, different Nim versions)
+- installing the build dependencies
+- building Nim and Nimble
+- running the tests
+
+
+
+
+## Usage
+
+To use this workflow, in the project's `.github/workflows/<name>.yml`you need
+to refer to it inside of `jobs.<name>.uses` field.\
+For example, the full file might look like this:
+
+```yaml
+name: CI
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  build:
+    uses: status-im/nimbus-common-workflow/.github/workflows/common.yml@main
+```
+
+By default, it is assumed that your project uses `nimble test` for its testing.
+
+
+
+
+### Customizing the test command
+
+In a case where you don't just run `nimble test`, or when you need some additional
+commands (e.g. installing additional libraries) before running the tests,
+you can specify the `jobs.<name>.with.test-command`.\
+For example:
+
+```yaml
+name: CI
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  build:
+    uses: status-im/nimbus-common-workflow/.github/workflows/common.yml@main
+    with:
+      test-command: |
+          nimble install -y toml_serialization json_serialization unittest2
+          nimble test
+```
+
+Or to run several different test commands:
+
+```yaml
+name: CI
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  build:
+    uses: status-im/nimbus-common-workflow/.github/workflows/common.yml@main
+    with:
+      test-command: |
+          nimble install -y libbacktrace
+          nimble test
+          nimble test_libbacktrace
+          nimble examples
+```