CI: Add support for GitHub actions (#680)

* Add initial workflows config

* Add PSQL service

* Add 32bit and frontend jobs

* Add gcc-multilib and fix typo

* Fix backtester test for linux/unix filesystem errors and npm commands

* 32-bit Add -race to purposefully throw an error to ensure envs are set correctly (will revert)

* Revert "32-bit Add -race to purposefully throw an error to ensure envs are set correctly (will revert)"

This reverts commit b97e66c49fca859f8738e01107f96f9ca4040b2e.

* Bump workers count for orderbook processing

* Remove comments to trigger 32-bit cache hit after job success

* Cancel addition plus version bump, spawn more overlords

* Update build badge to Github Actions

* Brach -> Branch

.github/workflows/linter.yml

@@ -0,0 +1,12 @@
+name: golangci-lint
+on: [push, pull_request]
+jobs:
+  golangci:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v2
+        with:
+          version: v1.31