Add gnupg to Dockerfile (#11365)

CirnoT · zeripath · web-flow · commit c9187b811647 · 2020-05-10T23:41:34.000+03:00
Co-authored-by: zeripath &lt;art27@cantab.net&gt;
diff --git a/Dockerfile b/Dockerfile
@@ -37,7 +37,8 @@ RUN apk --no-cache add \
     s6 \
     sqlite \
     su-exec \
-    tzdata
+    tzdata \
+    gnupg
 
 RUN addgroup \
     -S -g 1000 \
