Use goreleaser to publish GC releases

While we work on stolon, it will be important for us to use pre-release
candidates of our own changes. This commit adds goreleaser to
automatically create these on our own forks build.

.dockerignore

@@ -0,0 +1 @@
+.gitignore

.gitignore

@@ -16,3 +16,5 @@ bin/
 /release/
 
 .idea
+
+dist/

Dockerfile

@@ -0,0 +1,33 @@
+################################################################################
+# build
+################################################################################
+
+FROM golang:1.12 AS build
+COPY . /go/src/github.com/sorintlab/stolon
+WORKDIR /go/src/github.com/sorintlab/stolon
+
+# If we're running goreleaser, then our binaries will already be copied into our
+# work directory. Otherwise we should build them.
+RUN set -x \
+      && \
+      if [ ! -f stolonctl ]; then \
+        ./build; \
+        mv -v bin/* ./; \
+      fi
+
+################################################################################
+# release
+################################################################################
+
+FROM ubuntu:18.04 AS release
+RUN set -x \
+      && apt-get update -y \
+      && apt-get install -y curl gpg \
+      && sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt/ bionic-pgdg main\ndeb http://apt.postgresql.org/pub/repos/apt/ bionic-pgdg 11" > /etc/apt/sources.list.d/pgdg.list' \
+      && curl --silent https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add - \
+      && apt-get update -y \
+      && apt-get install -y software-properties-common pgbouncer postgresql-client \
+      && mkdir -pv /var/run/postgresql /var/log/postgresql
+
+COPY --from=build /go/src/github.com/sorintlab/stolon/stolon* /usr/local/bin/
+USER postgres

VERSION

@@ -0,0 +1 @@
+0.13.0-gc-rc1

circle.yml

@@ -0,0 +1,33 @@
+---
+version: 2
+
+jobs:
+  release:
+    working_directory: /go/src/github.com/sorintlab/stolon
+    docker:
+      - image: golang:1.12
+    steps:
+      - checkout
+      - run:
+          name: Release
+          command: |
+            CURRENT_VERSION="v$(cat VERSION)"
+
+            if [[ $(git tag -l "${CURRENT_VERSION}") == "${CURRENT_VERSION}" ]]; then
+              echo "Version ${CURRENT_VERSION} is already released"
+              exit 0
+            fi
+
+            curl -L -o /tmp/goreleaser_Linux_x86_64.tar.gz https://github.com/goreleaser/goreleaser/releases/download/v0.106.0/goreleaser_Linux_x86_64.tar.gz
+            tar zxf /tmp/goreleaser_Linux_x86_64.tar.gz -C /tmp
+
+            git tag "${CURRENT_VERSION}"
+            git push --tags
+
+            /tmp/goreleaser --rm-dist
+
+workflows:
+  version: 2
+  build-integration:
+    jobs:
+      - release

goreleaser.yml

@@ -0,0 +1,44 @@
+# View goreleaser docs for configuration settings
+# https://goreleaser.com
+
+---
+project_name: stolon
+
+release:
+  github:
+    owner: gocardless
+    name: stolon
+
+builds:
+  - binary: stolonctl
+    main: cmd/stolonctl/main.go
+    goos: &goos
+      - linux
+    goarch: &goarch
+      - amd64
+    ldflags: &ldflags >
+      -X cmd.Version={{.Version}}
+      -X cmd.Commit={{.Commit}}
+      -X cmd.Date={{.Date}}
+      -a
+      -installsuffix cgo
+    env: &env
+      - CGO_ENABLED=0
+  - binary: stolon-keeper
+    main: cmd/keeper/main.go
+    goos: *goos
+    goarch: *goarch
+    ldflags: *ldflags
+    env: *env
+  - binary: stolon-proxy
+    main: cmd/proxy/main.go
+    goos: *goos
+    goarch: *goarch
+    ldflags: *ldflags
+    env: *env
+  - binary: stolon-sentinel
+    main: cmd/sentinel/main.go
+    goos: *goos
+    goarch: *goarch
+    ldflags: *ldflags
+    env: *env