ci: switch alpine-tools image (#127)

.drone.yml

@@ -21,9 +21,8 @@ steps:
       - markdownlint 'content/**/*.md' 'README.md'
 
   - name: spellcheck
-    image: node:lts-alpine
+    image: thegeeklab/alpine-tools
     commands:
-      - npm install -g spellchecker-cli
       - spellchecker --files 'content/**/*.md' 'README.md' -d .dictionary -p spell indefinite-article syntax-urls frontmatter --frontmatter-keys title tags --no-suggestions
     environment:
       FORCE_COLOR: true
@@ -127,6 +126,6 @@ depends_on:
 
 ---
 kind: signature
-hmac: 184a4ce9d1ed31bbe840d2913d4126ebcc6188a26782741684b5f530001ab396
+hmac: 48967e06b85f280011e620920e20f28d824b0f6045d0327e0f15ee353a811813
 
 ...