ci: parallelize opt-in main amd64 builds [CI]

Merge PR #11. Build Backend, Agent, and Probe concurrently on main.

.woodpecker/main-amd64-build.yml

@@ -16,10 +16,26 @@ when:
 concurrency: 1
 
 steps:
-  - name: build-linux-amd64-images
+  - name: build-linux-amd64-backend
     image: bash
     environment:
       NUGET_PACKAGES: /home/justme/.nuget/packages
     commands:
-      - bash ci/build-main-amd64.sh
+      - bash ci/build-main-amd64.sh backend
+    depends_on: []
+
+  - name: build-linux-amd64-agent
+    image: bash
+    environment:
+      NUGET_PACKAGES: /home/justme/.nuget/packages
+    commands:
+      - bash ci/build-main-amd64.sh agent
+    depends_on: []
+
+  - name: build-linux-amd64-probe
+    image: bash
+    environment:
+      NUGET_PACKAGES: /home/justme/.nuget/packages
+    commands:
+      - bash ci/build-main-amd64.sh probe
     depends_on: []

ci/build-main-amd64.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# Build all main Linux amd64 runtime images locally when a commit opts into CI.
+# Build one Linux amd64 runtime image locally for an opt-in main commit.
 set -euo pipefail
 
 [[ "${CI_PIPELINE_EVENT:-}" == push && "${CI_COMMIT_BRANCH:-}" == main && "${CI_COMMIT_MESSAGE:-}" == *"[CI]"* ]] || {
@@ -7,26 +7,30 @@ set -euo pipefail
   exit 2
 }
 
+component="${1:?usage: build-main-amd64.sh <backend|agent|probe>}"
+case "$component" in
+  backend|agent|probe) ;;
+  *) echo "unsupported component: $component" >&2; exit 2 ;;
+esac
+
 root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
 work="$root/.release/main-amd64-build"
-base_home="/home/justme/woodpecker/buildah-home/main-amd64-build"
-mkdir -p "$work"
-export IMAGE_PUBLISH=false
+base_home="/home/justme/woodpecker/buildah-home/main-amd64-build-$component"
+mkdir -p "$work" "$base_home"
 
-BUILDAH_HOME="$base_home-backend" IMAGE_PUBLISH=false bash "$root/ci/release-linux.sh" amd64 backend
+if [[ "$component" == backend ]]; then
+  BUILDAH_HOME="$base_home" IMAGE_PUBLISH=false bash "$root/ci/release-linux.sh" amd64 backend
+  exit 0
+fi
 
-for component in agent probe; do
-  context="$work/$component"
-  home="$base_home-$component"
-  mkdir -p "$home"
-  export HOME="$home"
-  export BUILDAH_HOME="$home"
-  export REGISTRY_AUTH_FILE="$work/$component-auth.json"
+export HOME="$base_home"
+export BUILDAH_HOME="$base_home"
+export REGISTRY_AUTH_FILE="$work/$component-auth.json"
+context="$work/$component"
 
-  python3 "$root/ci/stage-node-image.py" "$component" "$context"
-  buildah bud --layers --network host --tls-verify=true --arch amd64 \
-    --build-arg APP_VERSION=main \
-    -f "$context/Containerfile" \
-    -t "localhost/monitor-$component:main-amd64-check" "$context"
-  echo "built local Linux amd64 $component image; not publishing it"
-done
+python3 "$root/ci/stage-node-image.py" "$component" "$context"
+buildah bud --layers --network host --tls-verify=true --arch amd64 \
+  --build-arg APP_VERSION=main \
+  -f "$context/Containerfile" \
+  -t "localhost/monitor-$component:main-amd64-check" "$context"
+echo "built local Linux amd64 $component image; not publishing it"