Add Earthfile and release workflow

.github/workflows/release.yaml

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+name: Release
+
+on:
+  workflow_dispatch:
+  push:
+    paths-ignore:
+      - './*.md'
+    tags:
+      - 'v[0-9]+.[0-9]+.*'
+    branches:
+      - master
+
+env:
+  DOCKER_USERNAME: ${{ vars.GHCR_USERNAME }}
+  DOCKER_PASSWORD: ${{ secrets.GHCR_TOKEN }}
+  FORCE_COLOR: 1
+
+jobs:
+  release:
+    if: startsWith(github.ref, 'refs/tags/v')
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Download latest earthly
+        run: "sudo /bin/sh -c 'wget https://github.com/earthly/earthly/releases/download/v0.8.3/earthly-linux-amd64 -O /usr/local/bin/earthly && chmod +x /usr/local/bin/earthly'"
+
+      - name: Put back the git branch into git (Earthly uses it for tagging)
+        run: |
+          branch=""
+          if [ -n "$GITHUB_HEAD_REF" ]; then
+            branch="$GITHUB_HEAD_REF"
+          else
+            branch="${GITHUB_REF##*/}"
+          fi
+          git checkout -b "$branch" || true
+
+      - name: Docker Login
+        run: docker login ghcr.io/librepod --username "$DOCKER_USERNAME" --password "$DOCKER_PASSWORD"
+
+      - name: Build and push docker image
+        run: |
+          earthly --ci --push +build \
+            --TARGET_DOCKER_REGISTRY=quay.io/librepod \
+            --ARGOCD_TAG=v2.9.6 \
+            --ARGOCD_BASE_IMAGE=quay.io/argoproj/argocd

.gitignore

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+.arg
+.secret

Earthfile

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+VERSION 0.7
+
+ARG --global TARGET_DOCKER_REGISTRY
+
+build:
+  ARG ARGOCD_TAG=v2.9.6
+  ARG ARGOCD_BASE_IMAGE=quay.io/argoproj/argocd
+
+  FROM ${ARGOCD_BASE_IMAGE}:${ARGOCD_TAG}
+
+  # Switch to root for the ability to perform install
+  USER root
+
+  RUN apt-get update
+
+  # Setup non-root user
+  WORKDIR /home/argocd
+
+  RUN apt-get update && apt-get --no-install-recommends --yes install \
+      jq curl \
+    && curl -L -o yq_linux_amd64.tar.gz https://github.com/mikefarah/yq/releases/download/v4.2.0/yq_linux_amd64.tar.gz \
+    && tar xzf ./yq_linux_amd64.tar.gz \
+    && chmod +x ./yq_linux_amd64 && mv ./yq_linux_amd64 /usr/local/bin/yq \
+    && curl -fsSL https://deb.nodesource.com/setup_21.x | bash - \
+    && apt-get install -y nodejs \
+    && npm install -g pnpm cdk8s-cli \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+  # Switch back to non-root user
+  USER 999
+
+  SAVE IMAGE --push ${TARGET_DOCKER_REGISTRY}/argocd-cdk8s:$ARGOCD_TAG