Add builder

Signed-off-by: Jacob Kiers <jacob@jacobkiers.net>

build.sh

@@ -0,0 +1,85 @@
+#!/usr/bin/env bash
+
+print_usage()
+{
+    echo "USAGE: $0 <slim|full> [rust version] [cross version]"
+    echo
+    echo "Arguments:"
+    echo -e "\t<slim|full>\tSlim build (without targets) or Full build (with targets)"
+    echo -e "\t[rust version]\tVersion of rust (https://github.com/rust-lang/rust)"
+    echo -e "\t[cross version]\tVersion of cross (https://github.com/cross-rs/cross)"
+    echo
+    echo "Both versions default to the latest version."
+}
+
+get_latest_release() {
+  curl --silent "https://api.github.com/repos/$1/releases/latest" | # Get latest release from GitHub api
+    grep '"tag_name":' |                                            # Get tag line
+    sed -E 's/.*"v?([^"]+)".*/\1/'                                  # Pluck JSON value
+}
+
+
+if command -v podman &> /dev/null
+then
+    BUILDER=podman
+elif command -v docker &> /dev/null
+then
+    BUILDER=docker
+else
+    echo "Prerequisite failed: either podman or docker must be installed"
+    exit 1
+fi
+
+if ! command -v envsubst &> /dev/null
+then
+    echo "Prerequisite failed: envsubst must be installed"
+    exit 1
+fi
+
+if [ $# -lt 1 ]; then
+    print_usage
+    exit 1
+fi
+
+case ${1} in
+    full | slim)
+        ;;
+
+    *)
+        echo "ERROR: The first argument mus either be 'full' or 'slim'."
+        echo
+        print_usage
+        exit 1
+        ;;
+esac
+
+set -e -o pipefail
+
+if [ -z "$2" ]; then
+    RUST_VERSION=$(get_latest_release 'rust-lang/rust')
+else
+    RUST_VERSION=$2
+fi
+
+if [ -z "$3" ]; then
+    CROSS_VERSION=$(get_latest_release 'cross-rs/cross')
+else
+    CROSS_VERSION=$3
+fi
+
+echo "Creating a ${1} build with Rust ${RUST_VERSION} and cross ${CROSS_VERSION}"
+
+export RUST_VERSION
+export CROSS_VERSION
+
+IMAGE="img.kie.rs/jjkiers/rust-dind-cross:rust${RUST_VERSION}-cross${CROSS_VERSION}-${1}"
+
+envsubst < Dockerfile-${1} | ${BUILDER} build -f - \
+    -t ${IMAGE} \
+    .
+
+echo "Built image ${IMAGE}"
+
+${BUILDER} push ${IMAGE}
+
+echo "Pushed image ${IMAGE}"