switch from travis to GitHub actions

.github/workflows/main.yml

@@ -0,0 +1,29 @@
+name: CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  format:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Ensure all files were formatted as per gofmt
+      run: |
+        gofmt -l $(find . -name '*.go') >/dev/null
+
+    - name: run tests
+      run: go test ./...
+
+    - name: install gokr-packer
+      run: go get -u github.com/gokrazy/tools/cmd/gokr-packer
+
+    - name: generate gokrazy disk image
+      run: |
+        export PATH=$PATH:$(go env GOPATH)/bin
+        gokr-packer -overwrite=full.img -target_storage_bytes=1610612736 github.com/gokrazy/hello

.travis.yml

@@ -1,16 +0,0 @@
-# Use the (faster) container-based infrastructure, see also
-# http://docs.travis-ci.com/user/workers/container-based-infrastructure/
-sudo: false
-
-language: go
-go:
-  - 1.14
-
-script:
-  # Check whether files are syntactically correct.
-  - "gofmt -l $(find . -name '*.go' | tr '\\n' ' ') >/dev/null"
-  # Check whether files were not gofmt'ed.
-  - gosrc=$(find . -name '*.go' | tr '\\n' ' '); [ $(gofmt -l $gosrc 2>&- | wc -l) -eq 0 ] || (echo 'gofmt was not run on these files:'; gofmt -l $gosrc 2>&-; false)
-  - go test ./...
-  - go get -u github.com/gokrazy/tools/cmd/gokr-packer
-  - gokr-packer -overwrite=full.img -target_storage_bytes=1610612736 github.com/gokrazy/hello