added README to workflows folder

.github/workflows/README.md

@@ -0,0 +1,55 @@
+# GitHub Actions Workflows
+
+## Setup
+- workloads run using [GitHub self-hosted runners](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/about-self-hosted-runners)
+- project admins maintain a private Google Compute Engine VM for running tests
+  - VM should be at least n1-standard-4 with 50GB persistent disk
+  - instructions for setting up the VM can be found in repo settings under "Actions"
+  - to set up dependencies, run the following commands:
+    ```
+    # install kubectl
+    sudo apt-get install kind kubectl
+    # install kind
+    curl -Lo ./kind "https://github.com/kubernetes-sigs/kind/releases/download/v0.7.0/kind-$(uname)-amd64"
+    chmod +x ./kind
+    sudo mv ./kind /usr/local/bin
+    # install skaffold
+    curl -Lo skaffold https://storage.googleapis.com/skaffold/releases/latest/skaffold-linux-amd64
+    chmod +x skaffold
+    sudo mv skaffold /usr/local/bin
+    # install docker
+    sudo apt install apt-transport-https ca-certificates curl gnupg2 software-properties-common
+    curl -fsSL https://download.docker.com/linux/debian/gpg | sudo apt-key add -
+    sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/debian $(lsb_release -cs) stable"
+    sudo apt update
+    sudo apt install docker-ce
+    sudo usermod -aG docker ${USER}
+    # logout and back on
+    exit
+    ```
+  - ensure GitHub Actions runs as background service:
+    ```
+    sudo ∼/actions-runner/svc.sh install
+    sudo ∼/actions-runner/svc.sh start
+    ```
+
+
+---
+## Workflows
+
+### Smoketests.yaml
+
+#### Triggers
+- commits pushed to master
+- PRs to master
+- PRs to release/ branches
+
+#### Actions
+- ensures kind cluster is running
+- builds all containers in src/
+- deploys local containers to kind
+  - ensures all pods reach ready state
+  - ensures HTTP request to frontend returns HTTP status 200
+- deploys manifests from /releases
+  - ensures all pods reach ready state
+  - ensures HTTP request to frontend returns HTTP status 200