TUN-8546: rework MacOS build script

The rework consists in building and packaging the cloudflared binary based on the OS & ARCH of the system.

read TARGET_ARCH from export and exit if TARGET_ARCH is not set

.teamcity/mac/build.sh

@@ -7,6 +7,12 @@ if [[ "$(uname)" != "Darwin" ]] ; then
     exit 1
 fi
 
+if [[ "amd64" != "${TARGET_ARCH}" && "arm64" != "${TARGET_ARCH}" ]]
+then
+  echo "TARGET_ARCH must be amd64 or arm64"
+  exit 1
+fi
+
 go version
 export GO111MODULE=on
 
@@ -137,56 +143,52 @@ fi
 
 # cleanup the build directory because the previous execution might have failed without cleaning up.
 rm -rf "${TARGET_DIRECTORY}"
-archs=("amd64" "arm64")
-export TARGET_OS=darwin
-for arch in ${archs[@]}; do
-  
-  FILENAME="$(pwd)/artifacts/cloudflared-darwin-$arch.tgz"
-  PKGNAME="$(pwd)/artifacts/cloudflared-$arch.pkg"
-  TARGET_ARCH=$arch GOCACHE="$PWD/../../../../" GOPATH="$PWD/../../../../" CGO_ENABLED=1 make cloudflared
+export TARGET_OS="darwin"
+FILENAME="$(pwd)/artifacts/cloudflared-darwin-$TARGET_ARCH.tgz"
+PKGNAME="$(pwd)/artifacts/cloudflared-$TARGET_ARCH.pkg"
+GOCACHE="$PWD/../../../../" GOPATH="$PWD/../../../../" CGO_ENABLED=1 make cloudflared
 
-  # sign the cloudflared binary
-  if [[ ! -z "$CODE_SIGN_NAME" ]]; then
-    codesign -s "${CODE_SIGN_NAME}" -f -v --timestamp --options runtime ${BINARY_NAME}
-    
-   # notarize the binary
-   # TODO: TUN-5789
-  fi
+# sign the cloudflared binary
+if [[ ! -z "$CODE_SIGN_NAME" ]]; then
+  codesign -s "${CODE_SIGN_NAME}" -f -v --timestamp --options runtime ${BINARY_NAME}
 
-  ARCH_TARGET_DIRECTORY="${TARGET_DIRECTORY}/${arch}-build"
-  # creating build directory
-  rm -rf $ARCH_TARGET_DIRECTORY
-  mkdir -p "${ARCH_TARGET_DIRECTORY}"
-  mkdir -p "${ARCH_TARGET_DIRECTORY}/contents"
-  cp -r ".mac_resources/scripts" "${ARCH_TARGET_DIRECTORY}/scripts"
+ # notarize the binary
+ # TODO: TUN-5789
+fi
 
-  # copy cloudflared into the build directory
-  cp ${BINARY_NAME} "${ARCH_TARGET_DIRECTORY}/contents/${PRODUCT}"
+ARCH_TARGET_DIRECTORY="${TARGET_DIRECTORY}/${arch}-build"
+# creating build directory
+rm -rf $ARCH_TARGET_DIRECTORY
+mkdir -p "${ARCH_TARGET_DIRECTORY}"
+mkdir -p "${ARCH_TARGET_DIRECTORY}/contents"
+cp -r ".mac_resources/scripts" "${ARCH_TARGET_DIRECTORY}/scripts"
 
-  # compress cloudflared into a tar and gzipped file
-  tar czf "$FILENAME" "${BINARY_NAME}"
+# copy cloudflared into the build directory
+cp ${BINARY_NAME} "${ARCH_TARGET_DIRECTORY}/contents/${PRODUCT}"
 
-  # build the installer package
-  if [[ ! -z "$PKG_SIGN_NAME" ]]; then
+# compress cloudflared into a tar and gzipped file
+tar czf "$FILENAME" "${BINARY_NAME}"
+
+# build the installer package
+if [[ ! -z "$PKG_SIGN_NAME" ]]; then
+  pkgbuild --identifier com.cloudflare.${PRODUCT} \
+      --version ${VERSION} \
+      --scripts ${ARCH_TARGET_DIRECTORY}/scripts \
+      --root ${ARCH_TARGET_DIRECTORY}/contents \
+      --install-location /usr/local/bin \
+      --sign "${PKG_SIGN_NAME}" \
+      ${PKGNAME}
+
+      # notarize the package
+      # TODO: TUN-5789
+else
     pkgbuild --identifier com.cloudflare.${PRODUCT} \
-        --version ${VERSION} \
-        --scripts ${ARCH_TARGET_DIRECTORY}/scripts \
-        --root ${ARCH_TARGET_DIRECTORY}/contents \
-        --install-location /usr/local/bin \
-        --sign "${PKG_SIGN_NAME}" \
-        ${PKGNAME}
-
-        # notarize the package
-        # TODO: TUN-5789
-  else
-      pkgbuild --identifier com.cloudflare.${PRODUCT} \
-        --version ${VERSION} \
-        --scripts ${ARCH_TARGET_DIRECTORY}/scripts \
-        --root ${ARCH_TARGET_DIRECTORY}/contents \
-        --install-location /usr/local/bin \
-        ${PKGNAME}
-  fi
-done
+      --version ${VERSION} \
+      --scripts ${ARCH_TARGET_DIRECTORY}/scripts \
+      --root ${ARCH_TARGET_DIRECTORY}/contents \
+      --install-location /usr/local/bin \
+      ${PKGNAME}
+fi
 
 # cleanup build directory because this script is not ran within containers,
 # which might lead to future issues in subsequent runs.