Setup some github actions (#37)

.github/workflows/flutterfmt.sh

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+#!/bin/sh
+DIRS="lib test"
+EXIT=0
+
+for DIR in $DIRS; do
+    OUT="$(flutter format -l 120 --suppress-analytics "$DIR" | sed -e "s/^Formatted \(.*\)/::error file=$DIR\/\1::Not formatted/g")"
+    echo "$OUT" | grep "::error" && EXIT=1
+done
+
+exit $EXIT

.github/workflows/flutterfmt.yml

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+name: Flutter format
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    paths:
+      - '.github/workflows/flutterfmt.yml'
+      - '.github/workflows/flutterfmt.sh'
+      - '**.dart'
+jobs:
+
+  gofmt:
+    name: Run flutter format
+    runs-on: ubuntu-latest
+    steps:
+
+      - name: Install flutter
+        uses: subosito/flutter-action@v1
+        with:
+          flutter-version: '2.0.5'
+
+      - name: Check out code
+        uses: actions/checkout@v2
+
+      - name: flutter format
+        run: $GITHUB_WORKSPACE/.github/workflows/flutterfmt.sh

.github/workflows/gofmt.sh

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+#!/bin/sh
+
+if [ -z "$1" ]; then
+    rm -f ./gofmterr
+    find . -iname '*.go' ! -name '*.pb.go' -exec "$0" {} \;
+    [ -f ./gofmterr ] && exit 1
+    exit 0
+fi
+
+OUT="$(./nebula/goimports -d "$1" | awk '{printf "%s%%0A",$0}')"
+if [ -n "$OUT" ]; then
+    echo "::error file=$1::$OUT"
+    touch ./gofmterr
+fi

.github/workflows/gofmt.yml

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+name: gofmt
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    paths:
+      - '.github/workflows/gofmt.yml'
+      - '.github/workflows/gofmt.sh'
+      - '**.go'
+jobs:
+
+  gofmt:
+    name: Run gofmt
+    runs-on: ubuntu-latest
+    steps:
+
+      - name: Set up Go 1.16
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.16
+        id: go
+
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@v2
+
+      - name: Install goimports
+        working-directory: nebula
+        run: |
+          go get golang.org/x/tools/cmd/goimports
+          go build golang.org/x/tools/cmd/goimports
+
+      - name: gofmt
+        run: $GITHUB_WORKSPACE/.github/workflows/gofmt.sh