Add libgit2 dev dependencies

Signed-off-by: Philip Laine <[email protected]>

Author: Philip Laine

.github/actions/run-tests/Dockerfile

@@ -2,7 +2,8 @@ FROM golang:1.15-alpine
 
 # Add any build or testing essential system packages
 RUN apk add --no-cache build-base git
-RUN apk add --no-cache --repository http://dl-cdn.alpinelinux.org/alpine/edge/community libgit2=1.1.0-r1
+RUN apk add gcc pkgconfig libc-dev
+RUN apk add --no-cache --repository http://dl-cdn.alpinelinux.org/alpine/edge/community libgit2-dev=1.1.0-r1
 
 # Use the GitHub Actions uid:gid combination for proper fs permissions
 RUN addgroup -g 116 -S test && adduser -u 1001 -S -g test test