Add docker healthcheck (#29351)

* Add docker healthcheck

and test ELEMENT_WEB_PORT envvar

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

---------

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

.github/workflows/docker.yaml

@@ -17,8 +17,6 @@ jobs:
         permissions:
             id-token: write # needed for signing the images with GitHub OIDC Token
             packages: write # needed for publishing packages to GHCR
-        env:
-            TEST_TAG: vectorim/element-web:test
         steps:
             - uses: actions/checkout@v4
               with:
@@ -52,26 +50,41 @@ jobs:
                   password: ${{ secrets.GITHUB_TOKEN }}
 
             - name: Build and load
+              id: test-build
               uses: docker/build-push-action@ca877d9245402d1537745e0e356eab47c3520991 # v6
               with:
                   context: .
                   load: true
-                  tags: ${{ env.TEST_TAG }}
 
             - name: Test the image
+              env:
+                  IMAGEID: ${{ steps.test-build.outputs.imageid }}
               run: |
+                  set -x
+
                   # Make a fake module to test the image
                   MODULE_PATH="modules/module_name/index.js"
                   mkdir -p $(dirname $MODULE_PATH)
                   echo 'alert("Testing");' > $MODULE_PATH
 
                   # Spin up a container of the image
-                  CONTAINER_ID=$(docker run --rm -dp 80:80 -v $(pwd)/modules:/tmp/element-web-modules ${{ env.TEST_TAG }})
+                  ELEMENT_WEB_PORT=8181
+                  CONTAINER_ID=$(
+                      docker run \
+                          --rm \
+                          -e "ELEMENT_WEB_PORT=$ELEMENT_WEB_PORT" \
+                          -dp "$ELEMENT_WEB_PORT:$ELEMENT_WEB_PORT" \
+                          -v $(pwd)/modules:/tmp/element-web-modules \
+                          "$IMAGEID" \
+                  )
 
                   # Run some smoke tests
-                  wget --retry-connrefused --tries=5 -q --wait=3 --spider http://localhost:80/modules/module_name/index.js
-                  MODULE_1=$(curl http://localhost:80/config.json | jq -r .modules[0])
-                  test "$MODULE_1" = "/${MODULE_PATH}"
+                  wget --retry-connrefused --tries=5 -q --wait=3 --spider "http://localhost:$ELEMENT_WEB_PORT/modules/module_name/index.js"
+                  MODULE_0=$(curl "http://localhost:$ELEMENT_WEB_PORT/config.json" | jq -r .modules[0])
+                  test "$MODULE_0" = "/${MODULE_PATH}"
+
+                  # Check healthcheck
+                  test "$(docker inspect -f {{.State.Running}} $CONTAINER_ID)" == "true"
 
                   # Clean up
                   docker stop "$CONTAINER_ID"

Dockerfile

@@ -46,3 +46,5 @@ USER nginx
 
 # HTTP listen port
 ENV ELEMENT_WEB_PORT=80
+
+HEALTHCHECK --start-period=5s CMD wget --retry-connrefused --tries=5 -q --wait=3 --spider http://localhost:$ELEMENT_WEB_PORT/config.json