Added Koperator performance test load container image building from the default branch

.github/workflows/docker_perf_test_load.yml

@@ -0,0 +1,64 @@
+name: Docker / Performance test load
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - "koperator-performance-test-load/v?[0-9]+.[0-9]+.[0-9]+"
+env:
+  PLATFORMS: linux/amd64
+jobs:
+  docker:
+    name: Docker
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Cache Docker layers
+        uses: actions/cache@v3
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.ref }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+
+      - name: Determine tag or commit
+        uses: haya14busa/action-cond@v1
+        id: refortag
+        with:
+          cond: ${{ startsWith(github.ref, 'refs/tags/') }}
+          if_true: ${{ github.ref }}
+          if_false: latest
+
+      - name: Determine image tag
+        id: imagetag
+        run: echo "value=${TAG_OR_BRANCH##*/}" >> $GITHUB_OUTPUT
+        env:
+          TAG_OR_BRANCH: ${{ steps.refortag.outputs.value }}
+
+      - name: Setup Docker metadata
+        id: setup-docker-metadata
+        uses: docker/metadata-action@v3
+        with:
+          images: ghcr.io/banzaicloud/koperator-performance-test-load
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.CR_PAT }}
+
+      - name: Build koperator-performance-test-load
+        uses: docker/build-push-action@v3
+        with:
+          tags: ghcr.io/banzaicloud/koperator-performance-test-load:${{ steps.imagetag.outputs.value }}
+          file: docs/benchmarks/loadgens/Dockerfile
+          platforms: ${{ env.PLATFORMS }}
+          push: true
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache

docs/benchmarks/loadgens/Dockerfile

@@ -1,17 +1,17 @@
-ARG GO_VERSION=1.12
+ARG GO_VERSION=1.19
 
 FROM golang:${GO_VERSION}-alpine AS builder
 
 ENV GOFLAGS="-mod=readonly"
 
-RUN apk add --update --no-cache ca-certificates make git curl mercurial bzr
+RUN apk add --update --no-cache ca-certificates make git curl mercurial
 
 RUN mkdir -p /build
 WORKDIR /build
 
 RUN git clone https://github.com/jamiealquiza/sangrenel.git
 
-WORKDIR sangrenel
+WORKDIR /build/sangrenel
 
 RUN go mod download && go build -o /sangrenel