feat: add zip package

Dockerfile

@@ -12,6 +12,7 @@ ENV GNUPG_ALPINE_VERSION="2.2.8-r0"
 ENV OPENSSL_DEV_ALPINE_VERSION="1.0.2q-r0"
 ENV GPP_ALPINE_VERSION="6.4.0-r9"
 ENV OPENSSH_DEV_ALPINE_VERSION="7.7_p1-r3"
+ENV ZIP_ALPINE_VERSION="3.0-r6"
 
 # The --no-cache option allows to not cache the index locally, which is useful for keeping containers small.
 RUN apk upgrade --update && \
@@ -22,7 +23,8 @@ RUN apk upgrade --update && \
     apk add --no-cache gnupg="$GNUPG_ALPINE_VERSION" && \
     apk add --no-cache openssl-dev="$OPENSSL_DEV_ALPINE_VERSION" && \
     apk add --no-cache g++="$GPP_ALPINE_VERSION" && \
-    apk add --no-cache openssh="$OPENSSH_DEV_ALPINE_VERSION"
+    apk add --no-cache openssh="$OPENSSH_DEV_ALPINE_VERSION" && \
+    apk add --no-cache zip="$ZIP_ALPINE_VERSION"
 
 # Fixes npm install of nodegit fails saying: libcurl-gnutls.so.4: cannot open shared object file: No such file or directory
 # See https://github.com/adaptlearning/adapt-cli/issues/84#issuecomment-413528490

README.md

@@ -11,6 +11,7 @@ Alpine Linux 3.8 with some preinstalled tools suitable for CI/CD platforms.
 * **openssh**: 7.7_p1-r3
 * **GnuPG**: 2.2.8-r0
 * **[hub](https://hub.github.com/)**: 2.6.0
+* **zip**: 3.0-r6
 
 Please note that versions come from [Alpine 3.8 package ecosystem](https://pkgs.alpinelinux.org/packages?branch=v3.8).