Crossbuild docker image for different architectures (#55)

* Crossbuild docker image

* Fix yaml syntax

* Github Actions timeout disabled

* Add linux/386, linux/arm/v6, linux/arm/v7, linux/ppc64le, linux/s390x docker images

* Remove linux/386, linux/ppc64le, linux/s390x docker images

* Remove "Github Packages" from build step name

Co-authored-by: Chris C. <twin@twinnation.org>

* Split workflow file to test/docker

* Forward RELEASE variable to GITHUB_ENV

* Bring back timeout for tests

Co-authored-by: Chris C. <twin@twinnation.org>

.github/workflows/test.yml

@@ -0,0 +1,31 @@
+name: build
+on:
+  pull_request:
+    paths-ignore:
+      - '*.md'
+  push:
+    branches:
+      - master
+    paths-ignore:
+      - '*.md'
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - name: Set up Go 1.15
+        uses: actions/setup-go@v1
+        with:
+          go-version: 1.15
+        id: go
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@v2
+      - name: Build binary to make sure it works
+        run: go build -mod vendor
+      - name: Test
+        run: go test -mod vendor ./... -race -coverprofile=coverage.txt -covermode=atomic
+      - name: Codecov
+        uses: codecov/codecov-action@v1.0.14
+        with:
+          file: ./coverage.txt