Updates workflows

dev-tools/Dockerfile

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+FROM python:3.9
+
+ENV PYTHONUNBUFFERED 1
+
+RUN mkdir /app /app/static /app/images
+
+WORKDIR /app
+
+COPY package.json requirements.txt .stylelintrc.js .stylelintignore /app/
+RUN pip install black
+
+RUN apt-get update && apt-get install -y curl
+RUN curl -sL https://deb.nodesource.com/setup_16.x | bash -
+RUN apt-get install -y nodejs
+RUN npm install .

dev-tools/package.json

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+{
+  "scripts": {
+    "watch:static": "yarn watch \"./bw-dev collectstatic\" bookwyrm/static/**"
+  },
+  "devDependencies": {
+    "eslint": "^8.9.0",
+    "prettier": "2.5.1",
+    "stylelint": "^14.5.0",
+    "watch": "^0.13.0"
+  },
+  "dependencies": {
+    "merge": "2.1.1",
+    "postcss": "^8.4.6"
+  }
+}

dev-tools/requirements.txt

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+black==21.4b2