add powershell build script template

Author: braydonk

templates/otelopscol/build.ps1.go.tmpl

@@ -0,0 +1,61 @@
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+#################################################################################
+# The build tooling from this repo is designed to be run on Linux. Eventually
+# we will be able to do cross-platform builds for the Ops Agent, but for now
+# we are still running in a Windows container. This script exists as a stop-gap
+# until proper cross-platform builds are possible.
+#################################################################################
+# This script builds the otelopscol binary with a particular name and path to
+# match the expectations of our build tooling. It will do the same thing as
+# our Makefiles in this repo do, mainly to ensure there is one source of truth
+# in this repo for exactly what version of Go is used to build the binary.
+#################################################################################
+
+param (
+    [string]$jmxHash = "",
+    [string]$outDir = "."
+)
+
+# Set up tools directory.
+$toolsDir="" + (Get-Location) + "\.tools" # Powershell moment
+New-Item -ItemType Directory -Force -Path $toolsDir | Out-Null
+
+# Download Go.
+$goZipPath="./go.windows-amd64.zip"
+$goDownloadURL="https://go.dev/dl/go{{ .GoVersion }}.windows-amd64.zip"
+Invoke-WebRequest $goDownloadURL -OutFile $goZipPath
+Expand-Archive -Path $goZipPath -DestinationPath $toolsDir
+Remove-Item $goZipPath
+$goBinDir="$toolsDir\go\bin"
+$goBin="$goBinDir\go"
+
+# Download OCB.
+$installOcbCommand="`$env:GOBIN='$toolsDir'; `$env:CGO_ENABLED=0; $goBin install -trimpath -ldflags='-s -w' go.opentelemetry.io/collector/cmd/builder@{{ .OpenTelemetryVersion }}"
+powershell.exe -Command $installOcbCommand
+$ocbBin="$toolsDir\builder.exe"
+
+# Generate the collector source.
+$ocbGenerateCommand="`$env:PATH='${goBinDir};${PATH}'; `$env:CGO_ENABLED=0; $ocbBin --skip-compilation --verbose --config manifest.yaml"
+powershell.exe -Command $ocbGenerateCommand
+
+# Build the collector.
+$ldFlags="-s -w"
+if ($jmxHash -ne "") {
+    $ldFlags+=" github.com/open-telemetry/opentelemetry-collector-contrib/receiver/jmxreceiver.MetricsGathererHash=$jmxHash"
+}
+$collectorBinPath="${outDir}/bin/google-cloud-metrics-agent_windows_amd64.exe"
+$buildCollectorCommand="`$env:GOWORK='off'; cd _build; $goBin build -p 32 -buildvcs=false -o='${collectorBinPath}' --ldflags='$ldFlags' ."
+powershell.exe -Command $buildCollectorCommand