alpine: add gpg for codecov/codecov-action 5.5 (#4476)

Author: jpnurmi

.github/alpine/Dockerfile

@@ -5,7 +5,7 @@ FROM ${BASE}
 RUN apk update
 
 # common
-RUN apk add bash build-base cmake curl git icu lsb-release-minimal nodejs npm sudo tar wget
+RUN apk add bash build-base cmake curl git gpg icu lsb-release-minimal nodejs npm sudo tar wget
 
 # sentry-native
 RUN apk add curl-dev docker-cli libunwind-dev libunwind-static linux-headers openssl-dev zlib-dev xz-dev xz-static