Add testing and github workflow

.github/workflows/main.yml

@@ -0,0 +1,40 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    if: github.event_name == 'pull_request'
+
+    steps:
+      - uses: actions/checkout@v1
+
+      - name: shellcheck
+        uses: azohra/shell-linter@v0.2.0
+
+      - name: hadolint
+        uses: brpaz/hadolint-action@master
+
+      - name: Build image
+        run: ./build.sh
+
+      - name: Run tests
+        run: ./test/test.sh
+
+  deploy:
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push'
+
+    steps:
+      - uses: actions/checkout@v1
+
+      - name: Log in to dockerhub
+        run: echo "${{ secrets.DOCKERHUB_TOKEN }}" | docker login -u ${{ secrets.DOCKERHUB_USERNAME }} --password-stdin
+
+      - name: Deploy image
+        run: ./build.sh --push --latest

Dockerfile

@@ -1,7 +1,12 @@
 FROM alpine:3.11
 
+
+ARG ARG_POSTFIX_VERSION
+ENV POSTFIX_VERSION $ARG_POSTFIX_VERSION
+
+# hadolint ignore=DL3018
 RUN apk add --no-cache \
-    postfix \
+    postfix=$POSTFIX_VERSION \
     rsyslog \
     runit
 

build.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env sh
+
+set -e
+
+# shellcheck disable=SC1090
+. "$(dirname "$0")"/conf.env
+
+while [ $# -gt 0 ]; do
+    case $1 in
+        --push)
+            PUSH=true
+            shift
+            ;;
+        --latest)
+            LATEST=true
+            shift
+            ;;
+        *)
+            shift
+            ;;
+    esac
+done
+
+docker build --build-arg=ARG_POSTFIX_VERSION="$POSTFIX_VERSION" \
+             -t "$DOCKER_IMAGE":"$POSTFIX_VERSION" .
+
+if [ x$PUSH = "xtrue" ]; then
+    docker push "$DOCKER_IMAGE":"$POSTFIX_VERSION"
+fi
+
+if [ x$LATEST = "xtrue" ]; then
+    docker tag "$DOCKER_IMAGE":"$POSTFIX_VERSION" "$DOCKER_IMAGE":latest
+    [ x$PUSH = "xtrue" ] && docker push "$DOCKER_IMAGE":latest
+fi

conf.env

@@ -0,0 +1,2 @@
+POSTFIX_VERSION=3.4.9-r0
+DOCKER_IMAGE=dcarrillo/postfix

tests/test.sh

@@ -0,0 +1,54 @@
+#!/usr/bin/env bash
+
+set -e
+
+if [ x"$DEBUG" = xtrue ]; then
+    set -x
+fi
+
+# shellcheck disable=SC2039
+trap _catch_err ERR
+trap _cleanup EXIT
+
+LOCAL_DIR="$(cd "$(dirname "$0")" ; pwd -P)"
+# shellcheck disable=SC1090
+. "$LOCAL_DIR"/../conf.env
+
+_catch_err()
+{
+    echo "Test FAILED"
+}
+
+_cleanup()
+{
+    echo "Cleaning up..."
+    docker rm -f "${POSTFIX_VERSION}"_test > /dev/null 2>&1
+}
+
+echo "Running container to be tested..."
+docker run --name "${POSTFIX_VERSION}"_test --rm \
+           -e MY_ROOT_ALIAS=mail_receiver \
+           -e MY_HOSTNAME=test_localhost \
+           -e MY_DOMAIN=test_localhost \
+           -e MY_NETWORKS=127.0.0.1 \
+           -d "${DOCKER_IMAGE}":"${POSTFIX_VERSION}" > /dev/null
+
+sleep 2
+
+DOCKER_EXEC="docker exec -i ${POSTFIX_VERSION}_test"
+
+echo "Preparing container to be tested..."
+$DOCKER_EXEC sh -c "adduser -S mail_receiver -s /bin/bash"
+$DOCKER_EXEC sh -c "apk -q add mailx"
+
+## Test 1 check receiving at aliased account
+echo "+++ Sending test mail to root user aliased as mail_receiver"
+$DOCKER_EXEC sh -c "echo 'This is a test...' | mail -s 'Testing postfix configuration' root@test_localhost"
+$DOCKER_EXEC sh -c "grep -q 'Subject: Testing postfix configuration' /var/spool/mail/mail_receiver"
+
+## Test 2 check rsyslog is logging to stdout
+echo "+++ Testing rsyslog is logging to stdout"
+$DOCKER_EXEC sh -c "logger -t test 'testing logging...'"
+docker logs "${POSTFIX_VERSION}"_test 2>/dev/null | tail -1 | grep -q 'testing logging...'
+
+echo "All tests succeeded !"