agola run: build images and push them when on a v.* tag

.agola/config.jsonnet

@@ -54,6 +54,51 @@ local task_build_docker_tests(version, arch) = {
   ],
 };
 
+local task_build_push_images(name, target, push) =
+  /*
+   * Currently, kaniko, has some issues with multi stage builds where it removes
+   * all the files in the container after every stage (excluding /kaniko) causing
+   * file not found errors when doing COPY commands.
+   * Workaround this buy putting all files inside /kaniko
+   */
+  local options = if !push then '--no-push' else '--destination sorintlab/%s:$AGOLA_GIT_TAG' % [target];
+  {
+    name: name,
+    runtime: {
+      arch: 'amd64',
+      containers: [
+        {
+          image: 'gcr.io/kaniko-project/executor:debug-v0.11.0',
+        },
+      ],
+    },
+    environment: {
+      DOCKERAUTH: { from_variable: 'dockerauth' },
+    },
+    shell: '/busybox/sh',
+    working_dir: '/kaniko',
+    steps: [
+      { type: 'restore_workspace', dest_dir: '/kaniko/agola' },
+    ] + std.prune([
+      if push then {
+        type: 'run',
+        name: 'generate docker auth',
+        command: |||
+          cat << EOF > /kaniko/.docker/config.json
+          {
+            "auths": {
+              "https://index.docker.io/v1/": { "auth" : "$DOCKERAUTH" }
+            }
+          }
+          EOF
+        |||,
+      },
+    ]) + [
+      { type: 'run', command: '/kaniko/executor --context=dir:///kaniko/agola --build-arg AGOLAWEB_IMAGE=sorintlab/agola-web:v0.1.1 --target %s %s' % [target, options] },
+    ],
+    depends: ['checkout code and save to workspace', 'integration tests', 'test docker driver'],
+  };
+
 {
   runs: [
     {
@@ -98,6 +143,44 @@ local task_build_docker_tests(version, arch) = {
             'build go 1.12 amd64',
           ],
         },
+        {
+          name: 'checkout code and save to workspace',
+          runtime: {
+            arch: 'amd64',
+            containers: [
+              {
+                image: 'alpine/git',
+              },
+            ],
+          },
+          steps: [
+            { type: 'clone' },
+            { type: 'save_to_workspace', contents: [{ source_dir: '.', dest_dir: '.', paths: ['**'] }] },
+          ],
+          depends: [],
+        },
+        task_build_push_images('test build docker "agola" image', 'agola', false) + {
+          when: {
+            branch: '#.*#',
+            ref: '#refs/pull/\\d+/head#',
+          },
+        },
+        task_build_push_images('test build docker "agolademo" image', 'agolademo', false) + {
+          when: {
+            branch: '#.*#',
+            ref: '#refs/pull/\\d+/head#',
+          },
+        },
+        task_build_push_images('build and push docker "agola" image', 'agola', true) + {
+          when: {
+            tag: '#v.*#',
+          },
+        },
+        task_build_push_images('build and push docker "agolademo" image', 'agolademo', true) + {
+          when: {
+            tag: '#v.*#',
+          },
+        },
       ],
     },
   ],

Dockerfile

@@ -1,3 +1,7 @@
+ARG AGOLAWEB_IMAGE="agola-web"
+
+FROM $AGOLAWEB_IMAGE as agola-web
+
 #######
 ####### Build the backend
 #######
@@ -16,6 +20,7 @@ COPY go.sum .
 
 RUN go mod download
 
+
 # builds the agola binaries
 FROM build_base AS server_builder