refactor: don't install all packages on all systems

.cirrus.yml

@@ -40,14 +40,6 @@ build_packages_task:
     # Don't install llvm
     sed -i '/function install_packages/,/^}/ s/llvm//' devel/scripts/install.sh
 
-    if [[ "$(uname -m)" != 'x86_64' ]]; then
-      # Don't install neovim
-      sed -i '/function install_packages/,/^}/ s/neovim//' devel/scripts/install.sh
-    fi
-
-    # Don't install zsh
-    sed -i '/function install_packages/,/^}/ s/zsh//' devel/scripts/install.sh
-
   script: |
     if [[ "$(uname -m)" == 'x86_64' ]]; then
       cmd="sed -i -e 's|mirrorlist=|#mirrorlist=|' -e 's|#baseurl=http://mirror.centos.org/centos/\$releasever|baseurl=https://vault.centos.org/7.9.2009|' /etc/yum.repos.d/CentOS-Base.repo"

.github/workflows/build.yml

@@ -79,9 +79,6 @@ jobs:
           # Don't install llvm
           sed -i '/function install_packages/,/^}/ s/llvm//' devel/scripts/install.sh
 
-          # Don't install zsh
-          sed -i '/function install_packages/,/^}/ s/zsh//' devel/scripts/install.sh
-
           cd devel/scripts
 
           packages=(

devel/scripts/install.sh

@@ -780,8 +780,12 @@ function install_packages() {
 
 	pushd "${DOWNLOADS_PATH}/packages" >/dev/null
 	if [[ "${#packages[@]}" -eq 0 ]]; then
-		packages=(
-			tzdb
+		if sed -n 's/^NAME=\(.*\)/\1/p' /etc/os-release 2>/dev/null | grep 'Alpine Linux' &>/dev/null; then
+			packages=()
+		else
+			packages=(tzdb)
+		fi
+		packages+=(
 			m4
 			zlib
 			libdb
@@ -810,15 +814,21 @@ function install_packages() {
 			mpfr
 			zstd
 			gdb
-			neovim
 			xxhash
 			ccache
 			libedit
 			libxml2
 			swig
 			llvm
-			zsh
 		)
+
+		if [[ "$(uname -m)" == 'x86_64' ]]; then
+			packages+=(neovim)
+		fi
+
+		if tty &>/dev/null; then
+			packages+=(zsh)
+		fi
 	fi
 
 	for package in "${packages[@]}"; do