Added reusable pipeline for core accounts

.github/workflows/reusable_terraform_plan_apply_core.yml

@@ -0,0 +1,122 @@
+name: terraform plan apply for core accounts
+on:
+  workflow_call:
+    inputs:
+      aws_region:
+        required: false
+        type: string
+        default: "eu-west-2"
+      terraform_version:
+        type: string
+        required: false
+        description: "The terraform version to use"
+        default: "~1"
+      env_path:
+        description: 'Path to the environment directory'
+        required: false
+        type: string
+        default: "terraform/environments"
+      account_name:
+        description: 'AWS account or environment name'
+        required: true
+        type: string
+      environment:
+        type: string
+        required: true
+        description: "Name of the environment, e.g. development"
+
+    secrets:
+      modernisation_platform_environments:
+        required: true
+      SLACK_WEBHOOK_URL:
+        required: true
+
+env:
+  WORKING_DIRECTORY: "${{ inputs.env_path }}/${{ inputs.account_name }}"
+  WORKSPACE_NAME: "${{ inputs.account_name }}-${{ inputs.environment }}"
+  ENVIRONMENT_MANAGEMENT: "${{ secrets.modernisation_platform_environments }}"
+  TF_IN_AUTOMATION: true
+
+jobs:
+  plan-and-apply:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+
+      - name: Check if test directory exists
+        if: github.event.ref != 'refs/heads/main'
+        id: check_test_directory
+        run: |
+            if [ -d "${WORKING_DIRECTORY}/test" ]; then
+              echo "skip_terratest=true" >> $GITHUB_OUTPUT
+            fi
+
+      - name: Setup Go
+        if: ${{ steps.check_test_directory.outputs.skip_terratest == 'true' }}
+        uses: actions/setup-go@cdcb36043654635271a94b9a6d1392de5bb323a7 # v5.0.1
+        with:
+          go-version: 1.21
+          cache-dependency-path: "${WORKING_DIRECTORY}/test/go.sum"
+
+      - name: Set Account Number
+        run: echo "ACCOUNT_NUMBER=$(jq -r -e '.modernisation_platform_account_id' <<< $ENVIRONMENT_MANAGEMENT)" >> $GITHUB_ENV
+
+      - name: configure aws credentials
+        uses: aws-actions/configure-aws-credentials@e3dd6a429d7300a6a4c196c26e071d42e0343502 # v4.0.2
+        with:
+          role-to-assume: "arn:aws:iam::${{ env.ACCOUNT_NUMBER }}:role/github-actions"
+          role-session-name: githubactionsrolesession
+          aws-region: ${{ inputs.aws_region }}
+
+      - name: Setup Terraform
+        uses: hashicorp/setup-terraform@651471c36a6092792c552e8b1bef71e592b462d8 # v3.1.1
+        with:
+          terraform_version: "${{ inputs.terraform_version }}"
+          terraform_wrapper: false
+
+      - name: Initialize Terraform
+        run: |
+          bash scripts/terraform-init.sh ${WORKING_DIRECTORY}
+
+      - name: Terraform Workspace Select
+        run: |
+          terraform -chdir="${WORKING_DIRECTORY}" workspace select ${WORKSPACE_NAME}
+
+      - name: Run Terratest
+        if: ${{ steps.check_test_directory.outputs.skip_terratest == 'true' }}
+        run: |
+          pushd ${WORKING_DIRECTORY}/test
+          go mod tidy
+          TEST=`go test | ${{ github.workspace }}/scripts/redact-output.sh | tee /dev/stderr | tail -n 1`
+          popd
+          TEST="> TERRATEST RESULT - ${{ inputs.account_name }}
+          ${TEST}"
+          pwd
+          ls
+          bash scripts/update-pr-comments.sh "${TEST}"
+
+      - name: Run Terraform Plan
+        if: github.event.ref != 'refs/heads/main'
+        run: |
+          echo "workspace path: ${{ github.workspace }}"
+          PLAN=`bash scripts/terraform-plan.sh ${WORKING_DIRECTORY} | tee /dev/stderr | grep '^Plan: \|^No changes.'`
+          PLAN="> TERRAFORM PLAN RESULT - ${{ inputs.account_name }}
+          ${PLAN}"
+          pwd
+          bash scripts/update-pr-comments.sh "${PLAN}"
+
+      - name: Run Terraform apply
+        if: github.event.ref == 'refs/heads/main'
+        run: |
+          bash scripts/terraform-apply.sh ${WORKING_DIRECTORY}
+
+      - name: Slack failure notification
+        if: ${{ failure() && github.ref == 'refs/heads/main' }}
+        uses: slackapi/slack-github-action@70cd7be8e40a46e8b0eced40b0de447bdb42f68e # v1.26.0
+        with:
+          payload: |
+            {"blocks":[{"type": "section","text": {"type": "mrkdwn","text": ":no_entry: Failed GitHub Action:"}},{"type": "section","fields":[{"type": "mrkdwn","text": "*Workflow:*\n<${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}|${{ github.workflow }}>"},{"type": "mrkdwn","text": "*Job:*\n${{ github.job }}"},{"type": "mrkdwn","text": "*Repo:*\n${{ github.repository }}"}]}]}
+        env:
+          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
+          SLACK_WEBHOOK_TYPE: INCOMING_WEBHOOK