Use cache for Playwright testcontainers images

.github/workflows/end-to-end-tests.yaml

@@ -48,6 +48,7 @@ jobs:
         outputs:
             num-runners: ${{ env.NUM_RUNNERS }}
             runners-matrix: ${{ steps.runner-vars.outputs.matrix }}
+            docker-cache-key: ${{ steps.runner-vars.outputs.docker-cache-key }}
         steps:
             - name: Checkout code
               uses: actions/checkout@v4
@@ -80,6 +81,12 @@ jobs:
               run: |
                   yarn build
 
+            # Heuristic for calculating a cache key which is based on all images we pass to testcontainers
+            - name: Calculate docker cache key
+              run: |
+                  grep -hr "Container(\"" --exclude-dir=snapshots --exclude-dir=sample-files playwright >> _docker_cache_key
+                  grep -hr -C1 "super(" playwright/testcontainers/ >> _docker_cache_key
+
             - name: Upload Artifact
               uses: actions/upload-artifact@v4
               with:
@@ -90,11 +97,14 @@ jobs:
             - name: Calculate runner variables
               id: runner-vars
               uses: actions/github-script@v7
+              env:
+                  DOCKER_CACHE_KEY: ${{ hashFiles('_docker_cache_key') }}
               with:
                   script: |
                       const numRunners = parseInt(process.env.NUM_RUNNERS, 10);
                       const matrix = Array.from({ length: numRunners }, (_, i) => i + 1);
                       core.setOutput("matrix", JSON.stringify(matrix));
+                      core.setOutput("docker-cache-key", process.env.DOCKER_CACHE_KEY);
 
     playwright:
         name: "Run Tests [${{ matrix.project }}] ${{ matrix.runner }}/${{ needs.build.outputs.num-runners }}"
@@ -164,6 +174,11 @@ jobs:
               if: matrix.project == 'WebKit' && steps.playwright-cache.outputs.cache-hit == 'true'
               run: yarn playwright install-deps webkit
 
+            - name: Docker image cache
+              uses: ScribeMD/docker-cache@fb28c93772363301b8d0a6072ce850224b73f74e # 0.5.0
+              with:
+                  key: ${{ needs.build.outputs.docker-cache-key }}
+
             # We skip tests tagged with @mergequeue when running on PRs, but run them in MQ and everywhere else
             - name: Run Playwright tests
               run: |

.github/workflows/playwright-image-updates.yaml

@@ -17,7 +17,7 @@ jobs:
                   docker pull "$IMAGE"
                   INSPECT=$(docker inspect --format='{{index .RepoDigests 0}}' "$IMAGE")
                   DIGEST=${INSPECT#*@}
-                  sed -i "s/const TAG.*/const TAG = \"develop@$DIGEST\";/" playwright/testcontainers/synapse.ts
+                  sed -i "s,`$IMAGE.*`,`$IMAGE@$DIGEST`," playwright/testcontainers/synapse.ts
               env:
                   IMAGE: ghcr.io/element-hq/synapse:develop
 

playwright/services.ts

@@ -50,7 +50,7 @@ export const test = base.extend<{}, Services>({
     ],
     postgres: [
         async ({ logger, network }, use) => {
-            const container = await new PostgreSqlContainer()
+            const container = await new PostgreSqlContainer("postgres:13.3-alpine")
                 .withNetwork(network)
                 .withNetworkAliases("postgres")
                 .withLogConsumer(logger.getConsumer("postgres"))

playwright/testcontainers/synapse.ts

@@ -17,8 +17,6 @@ import { Credentials } from "../plugins/homeserver";
 import { deepCopy } from "../plugins/utils/object.ts";
 import { HomeserverContainer, StartedHomeserverContainer } from "./HomeserverContainer.ts";
 
-const TAG = "develop@sha256:b69222d98abe9625d46f5d3cb01683d5dc173ae339215297138392cfeec935d9";
-
 const DEFAULT_CONFIG = {
     server_name: "localhost",
     public_baseurl: "", // set by start method
@@ -144,7 +142,9 @@ export class SynapseContainer extends GenericContainer implements HomeserverCont
     private config: typeof DEFAULT_CONFIG;
 
     constructor() {
-        super(`ghcr.io/element-hq/synapse:${TAG}`);
+        super(
+            `ghcr.io/element-hq/synapse:develop@sha256:b69222d98abe9625d46f5d3cb01683d5dc173ae339215297138392cfeec935d9`,
+        );
 
         this.config = deepCopy(DEFAULT_CONFIG);
         this.config.registration_shared_secret = randB64Bytes(16);