Add Woodpecker CI for Docker images and set default port in Dockerfile

.woodpecker.yml

@@ -0,0 +1,10 @@
+steps:
+  - name: docker
+    image: docker
+    commands:
+      - docker login -u $DOCKER_USERNAME -p $DOCKER_PASSWORD
+      - export VERSION=$(cat core/config/config.go | grep "v[0-9]\+\.[0-9]\+" -o)
+      - docker image build -t "vnpower/pixivfe:$VERSION" .
+      - docker image push "vnpower/pixivfe:$VERSION"
+    secrets: [ DOCKER_USERNAME, DOCKER_PASSWORD ]
+    

Dockerfile

@@ -2,6 +2,9 @@
 FROM golang:1.22 as builder
 WORKDIR /app
 
+# 8282 is the default port for Docker
+ENV PIXIVFE_PORT=8282
+
 COPY go.* ./
 RUN go mod download
 COPY . ./

doc/Environment Variables.go

@@ -69,7 +69,7 @@ var EnvList []*EnvVar = []*EnvVar{
 		// **Required**: No
 		//
 		// Set this to a number to enable the built-in rate limiter. For example `PIXIVFE_REQUESTLIMIT=15`.
-		// 
+		//
 		// It might be better to enable rate limiting in the reverse proxy in front of PixivFE rather than using this.
 	},
 	{