use custom binary for arm64 linux release (#1065)

.github/goreleaser.yaml

@@ -21,9 +21,13 @@ builds:
     binary: pomerium
     goarch:
       - amd64
+      - arm64
     goos:
       - linux
       - darwin
+    ignore:
+      - goos: darwin
+        goarch: arm64
 
     ldflags:
       - -s -w
@@ -36,8 +40,8 @@ builds:
     hooks:
       post:
         - cmd: ./scripts/embed-envoy.bash {{ .Path }}
-          env:
-            - GOOS={{ .Target }}
+          env: # e.g. darwin_amd64
+            - TARGET={{ .Target }}
 
   - id: pomerium-cli
     main: cmd/pomerium-cli/cli.go

scripts/embed-envoy.bash

@@ -5,16 +5,14 @@ BINARY=$1
 
 ENVOY_VERSION=1.14.2
 DIR=$(dirname "${BINARY}")
-GOOS=$(echo "${GOOS-}" | cut -d _ -f 1) # goreleaser is fine
+TARGET="${TARGET:-"$(go env GOOS)_$(go env GOARCH)"}"
 
-GOOS=$(go env GOOS)
-
-if [ "${GOOS}" == "darwin" ]; then
+if [[ "${TARGET}" == darwin_* ]]; then
   ENVOY_PLATFORM="darwin"
-elif [ "${GOOS}" == "linux" ]; then
+elif [[ "${TARGET}" == linux_* ]]; then
   ENVOY_PLATFORM="linux_glibc"
 else
-  echo "unsupported"
+  echo "unsupported TARGET: ${TARGET}"
   exit 1
 fi
 
@@ -22,9 +20,15 @@ fi
 ## https://godoc.org/github.com/tetratelabs/getenvoy/pkg/binary/envoy
 ## https://golang.org/pkg/archive/zip/#Writer.SetOffset
 export PATH=$PATH:$(go env GOPATH)/bin
-HOME=${DIR} getenvoy fetch standard:${ENVOY_VERSION}/${ENVOY_PLATFORM}
-ENVOY_PATH=${DIR}/.getenvoy/builds/standard/${ENVOY_VERSION}/${ENVOY_PLATFORM}/bin
-ARCHIVE=${ENVOY_PATH}/envoy.zip
+if [ "$TARGET" == "linux_arm64" ]; then
+  ENVOY_PATH="$DIR/$TARGET"
+  mkdir -p "$ENVOY_PATH"
+  curl -L -o "$ENVOY_PATH/envoy" https://github.com/pomerium/envoy-binaries/releases/download/v0.1.0/envoy-linux-arm64
+else
+  env HOME="${DIR}" getenvoy fetch standard:${ENVOY_VERSION}/${ENVOY_PLATFORM}
+  ENVOY_PATH=${DIR}/.getenvoy/builds/standard/${ENVOY_VERSION}/${ENVOY_PLATFORM}/bin
+fi
+ARCHIVE="${ENVOY_PATH}/envoy.zip"
 
 (
   cd "${ENVOY_PATH}"