Update docs, use apt-get for yarn

docs/dev/recipe-client-addon/install.rst

@@ -28,7 +28,7 @@ Installation
 
    .. code-block:: bash
 
-      npm install
+      yarn install
       npm run build
 
 Once you've finished these steps, you should be ready to build an XPI or copy

docs/dev/recipe-client-addon/workflow.rst

@@ -12,7 +12,7 @@ install and build the latest dependencies:
 .. code-block:: bash
 
    cd recipe-client-addon
-   npm install
+   yarn install
    npm run build
 
 This will create a ``vendor`` directory containing a ``.js`` for each
@@ -32,7 +32,7 @@ To add a dependency:
 
    .. code-block:: bash
 
-      npm install --save ajv@5.2.2
+      yarn add --save ajv@5.2.2
 
    Version numbers in ``package.json`` must be set to an exact match to avoid
    bugs from downloading newer versions of libraries that we haven't tested
@@ -149,7 +149,7 @@ installed within to get the eslint plugins we rely on:
 .. code-block:: bash
 
    cd recipe-client-addon
-   npm install
+   yarn install
    ./node_modules/.bin/eslint .
 
 .. _eslint: http://eslint.org/

docs/dev/recipe-server/install.rst

@@ -67,7 +67,7 @@ Installation
 
    .. code-block:: bash
 
-      npm install
+      yarn install
       npm run build
 
 6. Create a Postgres database for Normandy. By default it is assumed to be named

docs/dev/recipe-server/workflow.rst

@@ -35,7 +35,7 @@ steps, as they don't affect your setup if nothing has changed:
 
    # Install new dependencies or update existing ones.
    pip install -r requirements/default.txt -c requirements/constraints.txt
-   npm install
+   yarn install
 
    # Run database migrations.
    python manage.py migrate

recipe-server/Dockerfile

@@ -11,7 +11,11 @@ RUN curl -s https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add -
     echo 'deb https://deb.nodesource.com/node_8.x jessie main' > /etc/apt/sources.list.d/nodesource.list && \
     echo 'deb-src https://deb.nodesource.com/node_8.x jessie main' >> /etc/apt/sources.list.d/nodesource.list && \
     apt-get update && apt-get install -y nodejs
-RUN npm install -g npm@5 && npm install -g yarn@1.0.0
+RUN npm install -g npm@5
+
+RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - \
+    echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list
+RUN apt-get update && apt-get install yarn
 
 COPY ./requirements /app/requirements
 COPY ./package.json /app/package.json