Add automation for releasing the project

Author: mdelapenya

.ci/scripts/build.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+
+function git_branch_name() {
+  echo $(git symbolic-ref --short HEAD)
+}
+
+readonly BINARY="swcg"
+readonly BRANCH="${TRAVIS_BRANCH:-$(git_branch_name)}"
+readonly GO_VERSION="1.12"
+readonly GO_WORKSPACE="/usr/local/go/src/github.com/mdelapenya/lpn"
+readonly VERSION="$(cat ./VERSION.txt)"
+
+if [[ "$BRANCH" != "master" ]]; then
+    echo "It's not possible to build from a branch different to master"
+    exit 1
+fi
+
+for GOOS in darwin linux windows; do
+    goos="${GOOS}"
+    extension=""
+
+    if [[ "$GOOS" == "windows" ]]; then
+        goos="win"
+        extension=".exe"
+    fi
+
+    for GOARCH in 386 amd64; do
+        arch="${GOARCH}"
+
+        if [[ "$GOARCH" == "amd64" ]]; then
+            arch="64"
+        fi
+
+        echo ">>> Building for ${GOOS}/${GOARCH}"
+        docker run --rm -v "$(pwd)":${GO_WORKSPACE} -w ${GO_WORKSPACE} \
+            -e GOOS=${GOOS} -e GOARCH=${GOARCH} golang:${GO_VERSION} \
+            go build -v -o ${GO_WORKSPACE}/.github/releases/download/${VERSION}/${goos}${arch}-${BINARY}${extension}
+    done
+done

.gitignore

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+.github

VERSION.txt

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+0.1.0