OSAC-794: add Slack notification step to step registry

ci-operator/step-registry/osac-project/notify/OWNERS

@@ -0,0 +1,4 @@
+approvers:
+  - osac-cicd
+reviewers:
+  - osac-cicd

ci-operator/step-registry/osac-project/notify/osac-project-notify-commands.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+
+set -euo pipefail
+
+WEBHOOK_URL="$(cat /var/run/vault/osac-slack-webhook/url)"
+PROW_URL="https://prow.ci.openshift.org/view/gs/test-platform-results"
+
+if [[ "${JOB_TYPE:-}" != "periodic" ]]; then
+    echo "Skipping Slack notification for non-periodic job (type: ${JOB_TYPE:-unknown})"
+    exit 0
+fi
+
+JOB_URL="${PROW_URL}/logs/${JOB_NAME}/${BUILD_ID}"
+
+RESULT="UNKNOWN"
+EMOJI=":white_circle:"
+if [[ -f "${SHARED_DIR}/test-result" ]]; then
+    RESULT=$(cat "${SHARED_DIR}/test-result")
+fi
+if [[ "${RESULT}" == "PASSED" ]]; then
+    EMOJI=":large_green_circle:"
+elif [[ "${RESULT}" == "FAILED" ]]; then
+    EMOJI=":red_circle:"
+fi
+
+VERSIONS=""
+if [[ -f "${SHARED_DIR}/versions.txt" ]]; then
+    while IFS= read -r line; do
+        VERSIONS="${VERSIONS}\n${line}"
+    done < "${SHARED_DIR}/versions.txt"
+fi
+
+MESSAGE="${EMOJI} *${JOB_NAME}* — ${RESULT}\n<${JOB_URL}|View logs>"
+if [[ -n "${VERSIONS}" ]]; then
+    MESSAGE="${MESSAGE}\n\n*Versions:*\n\`\`\`${VERSIONS}\n\`\`\`"
+fi
+
+curl --fail --silent --show-error \
+    --connect-timeout 10 --max-time 30 \
+    -X POST -H 'Content-type: application/json' \
+    --data "{\"text\":\"${MESSAGE}\"}" \
+    "${WEBHOOK_URL}"

ci-operator/step-registry/osac-project/notify/osac-project-notify-ref.metadata.json

@@ -0,0 +1,11 @@
+{
+	"path": "osac-project/notify/osac-project-notify-ref.yaml",
+	"owners": {
+		"approvers": [
+			"osac-cicd"
+		],
+		"reviewers": [
+			"osac-cicd"
+		]
+	}
+}

ci-operator/step-registry/osac-project/notify/osac-project-notify-ref.yaml

@@ -0,0 +1,16 @@
+ref:
+  as: osac-project-notify
+  best_effort: true
+  from: dev-scripts
+  timeout: 5m0s
+  commands: osac-project-notify-commands.sh
+  credentials:
+  - namespace: test-credentials
+    name: osac-slack-webhook
+    mount_path: /var/run/vault/osac-slack-webhook
+  resources:
+    requests:
+      cpu: 100m
+      memory: 200Mi
+  documentation: |-
+    Sends a Slack notification with the job result and a link to the Prow logs.