Adding workflow and script to build helm chart.

.woodpecker/helm.yaml

@@ -0,0 +1,36 @@
+steps:
+  helm:
+    when:
+      - event: pull_request
+        branch: main
+      - event: push
+        branch: main
+    image: alpine/helm:4.1.1
+    environment:
+      helm_registry: codeberg.org
+      helm_username: ${CI_REPO_OWNER}
+
+      # To create helm_password:
+      # 1. Go to https://codeberg.org/user/settings/applications.
+      # 2. Create a token with these settings:
+      #   - Token name: https://git.deuxfleurs.fr/3uzbcqje/garage/src/branch/main-v2/.woodpecker/helm.yaml
+      #   - Set package permission to "Read and write".
+      # 3. Click "Generate token".
+      # 4. Copy the token.
+      # 5. Log into https://ci.codeberg.org.
+      # 6. Find your repo, and add a secret with these settings:
+      #   - Name: helm_password
+      #   - Value: <the token you copied earlier>
+      # 7. Click "Add secret".
+
+      helm_password:
+        from_secret: helm_password
+
+      git_repo_owner: ${CI_REPO_OWNER}
+    commands:
+      - |
+        if [[ "${CI_PIPELINE_EVENT}" == "push" && "${CI_COMMIT_BRANCH}" == "main" ]]; then
+          ./pipeline.sh push
+        else
+          ./pipeline.sh
+        fi

pipeline.sh

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+#!/usr/bin/env bash
+
+# https://vaneyckt.io/posts/safer_bash_scripts_with_set_euxo_pipefail/
+# Not using "-x" because we aren't debugging.
+set -Eeuo pipefail
+
+# We get unbound var err if we don't set arg
+arg="${1:-}"
+
+echo "$helm_password" | helm registry login -u "$helm_username" --password-stdin "$helm_registry"
+
+helm lint "script/helm/garage"
+
+for chart in "script/helm/garage"; do
+  chart_name=$(echo "$chart" | cut -d/ -f2)
+  chart_version=$(grep '^version: ' "${chart}/Chart.yaml" | cut -d' ' -f 2)
+
+  helm package "${chart}"
+
+  # If chart already exists in the chart repository, don't push.
+  if helm pull "oci://${helm_registry}/${git_repo_owner}/charts/${chart_name}" --version "${chart_version}" &> /dev/null; then
+    echo -e "\e[31mWARNING: Chart ${chart_name} version ${chart_version} already exists in the repository.\nThis means that the chart's code has not changed, or you forgot to update the version in Chart.yaml.\e[0m"
+  else
+    if [[ $arg == 'push' ]]; then
+      helm push "${chart_name}-${chart_version}.tgz" "oci://${helm_registry}/${git_repo_owner}/charts"
+    fi
+  fi
+done