fixup! fixup! CI: Cache packages

Author: luke-jr

.github/workflows/build.yaml

@@ -66,24 +66,25 @@ jobs:
           case "${{ matrix.os }}" in
             debian:*|ubuntu:*)
               PKG_CACHE_DIR="/var/cache/apt"
-              INSTALL_CMD="apt update && apt install -y"
+              INSTALL_CMD="apt update && apt -o APT::Clean-Installed=0 install -y"
               PACKAGES="git libc6-dev cmake libcurl4-openssl-dev libjansson-dev libsodium-dev pkgconf"
               PACKAGES_API="libmicrohttpd-dev"
               CLEANUP_CACHE_CMD="rm -rfv ${PKG_CACHE_DIR}/archives/{partial,lock}"
               ;;
             almalinux:*|amazonlinux:*|fedora:*|oraclelinux:*)
               PKG_CACHE_DIR="/var/cache/dnf"
-              INSTALL_CMD="dnf install -y"
-              [[ "${{ matrix.os }}" =~ ^almalinux: ]] && INSTALL_CMD="dnf install -y dnf-plugins-core && dnf config-manager --set-enabled crb && $INSTALL_CMD"
-              [[ "${{ matrix.os }}" =~ ^oraclelinux: ]] && INSTALL_CMD="dnf install -y dnf-plugins-core && dnf config-manager --set-enabled ol9_codeready_builder && $INSTALL_CMD"
-              [[ "${{ matrix.os }}" =~ ^(alma|oracle)linux: ]] && INSTALL_CMD="dnf install -y epel-release && $INSTALL_CMD"
+              DNF_INSTALL="dnf --setopt=keepcache=True install -y"
+              INSTALL_CMD="$DNF_INSTALL"
+              [[ "${{ matrix.os }}" =~ ^almalinux: ]] && INSTALL_CMD="$DNF_INSTALL dnf-plugins-core && dnf config-manager --set-enabled crb && $INSTALL_CMD"
+              [[ "${{ matrix.os }}" =~ ^oraclelinux: ]] && INSTALL_CMD="$DNF_INSTALL dnf-plugins-core && dnf config-manager --set-enabled ol9_codeready_builder && $INSTALL_CMD"
+              [[ "${{ matrix.os }}" =~ ^(alma|oracle)linux: ]] && INSTALL_CMD="$DNF_INSTALL epel-release && $INSTALL_CMD"
               PACKAGES="git cmake libcurl-devel jansson-devel libsodium-devel pkgconf"
               PACKAGES_API="libmicrohttpd-devel"
               [[ "${{ matrix.config.cmake_args }}" =~ clang|gcc ]] || PACKAGES="$PACKAGES gcc"
               ;;
             alpine:*)
               PKG_CACHE_DIR="/var/cache/apk"
-              INSTALL_CMD="apk add"
+              INSTALL_CMD="ln -s /var/cache/apk /etc/apk/cache && apk add"
               PACKAGES="git build-base cmake argp-standalone curl-dev jansson-dev libsodium-dev"
               PACKAGES_API="libmicrohttpd-dev"
               ;;