Chore: build containers

- os: linux
- arch: amd64, arm64

Resolves: #84

.goreleaser.yml

@@ -16,6 +16,44 @@ builds:
   - windows
   env:
   - CGO_ENABLED=0
+dockers:
+- image_templates:
+  - 'ghcr.io/luzilla/{{.ProjectName}}:{{ .Tag }}-amd64'
+  dockerfile: Dockerfile
+  use: buildx
+  build_flag_templates:
+  - "--pull"
+  - "--label=org.opencontainers.image.created={{.Date}}"
+  - "--label=org.opencontainers.image.name={{.ProjectName}}"
+  - "--label=org.opencontainers.image.revision={{.FullCommit}}"
+  - "--label=org.opencontainers.image.version={{.Version}}"
+  - "--label=org.opencontainers.image.source={{.GitURL}}"
+  - "--platform=linux/amd64"
+  extra_files:
+  - rbls.ini
+  - targets.ini
+  goarch: amd64
+- image_templates:
+  - 'ghcr.io/luzilla/{{.ProjectName}}:{{ .Tag }}-arm64'
+  dockerfile: Dockerfile
+  use: buildx
+  build_flag_templates:
+  - "--pull"
+  - "--label=org.opencontainers.image.created={{.Date}}"
+  - "--label=org.opencontainers.image.name={{.ProjectName}}"
+  - "--label=org.opencontainers.image.revision={{.FullCommit}}"
+  - "--label=org.opencontainers.image.version={{.Version}}"
+  - "--label=org.opencontainers.image.source={{.GitURL}}"
+  - "--platform=linux/arm64"
+  extra_files:
+  - rbls.ini
+  - targets.ini
+  goarch: arm64
+docker_manifests:
+- name_template: ghcr.io/luzilla/{{.ProjectName}}:{{ .Tag }}
+  image_templates:
+  - ghcr.io/luzilla/{{.ProjectName}}:{{ .Tag }}-amd64
+  - ghcr.io/luzilla/{{.ProjectName}}:{{ .Tag }}-arm64
 archives:
 - files:
   - none*

Dockerfile

@@ -0,0 +1,15 @@
+FROM alpine:3
+
+ENV DNSBL_EXP_RESOLVER=ubound:53
+ENV DNSBL_EXP_RBLS=/etc/dnsbl-exporter/rbls.ini
+ENV DNSBL_EXP_TARGETS=/etc/dnsbl-exporter/targets.ini
+
+COPY dnsbl-exporter /usr/bin/
+
+RUN mkdir -p /etc/dnsbl-exporter
+COPY rbls.ini /etc/dnsbl-exporter/
+COPY targets.ini /etc/dnsbl-exporter/
+
+EXPOSE 9211
+
+ENTRYPOINT ["/usr/bin/dnsbl-exporter"]

Makefile

@@ -4,6 +4,10 @@ GO_VERSION:=1.16
 build:
 	goreleaser build --snapshot --single-target --rm-dist
 
+.PHONY: snapshot
+snapshot:
+	goreleaser build --snapshot --rm-dist
+
 .PHONY: test
 test:
 	docker run \

README.md

@@ -39,7 +39,43 @@ $ dnsbl-exporter -h
 
  Go to http://127.0.0.1:9211/ in your browser.
 
-#### Quering
+#### Container
+
+Docker/OCI images are available in the [container registry](/~https://github.com/orgs/Luzilla/packages?repo_name=dnsbl_exporter):
+
+```sh
+$ docker pull ghcr.io/luzilla/dnsbl_exporter:vX.Y.Z
+...
+```
+
+Please note: `latest` is not provided.
+
+The images expect `target.ini` and `rbls.ini` in the following location:
+
+```sh
+/etc/dnsbl-exporter
+```
+
+Either start the container and supply the contents, or build your own image:
+
+```sh
+docker run \
+    --rm \
+    -e DNSBL_EXP_RESOLVER=your.resolver:53 \
+    -p 9211:9211 \
+    -v ./conf:/etc/dnsbl-exporter \
+    ghcr.io/luzilla/dnsbl_exporter:vA.B.C
+```
+
+```docker
+FROM ghcr.io/luzilla/dnsbl_exporter:vA.B.C
+
+ADD my-target.ini /etc/dnsbl-exporter/target.ini
+ADD my-rbls.ini /etc/dnsbl-exporter/rbls.ini
+```
+
+
+#### Querying
 
 The individual configured servers and their status are represented by a **gauge**:
 

app/app.go

@@ -30,24 +30,28 @@ func NewApp(name string, version string) DNSBLApp {
 	app.Version = version
 	app.Flags = []cli.Flag{
 		cli.StringFlag{
-			Name:  "config.dns-resolver",
-			Value: "127.0.0.1:53",
-			Usage: "IP address[:port] of the resolver to use.",
+			Name:   "config.dns-resolver",
+			Value:  "127.0.0.1:53",
+			Usage:  "IP address[:port] of the resolver to use.",
+			EnvVar: "DNSBL_EXP_RESOLVER",
 		},
 		cli.StringFlag{
-			Name:  "config.rbls",
-			Value: "./rbls.ini",
-			Usage: "Configuration file which contains RBLs",
+			Name:   "config.rbls",
+			Value:  "./rbls.ini",
+			Usage:  "Configuration file which contains RBLs",
+			EnvVar: "DNSBL_EXP_RBLS",
 		},
 		cli.StringFlag{
-			Name:  "config.targets",
-			Value: "./targets.ini",
-			Usage: "Configuration file which contains the targets to check.",
+			Name:   "config.targets",
+			Value:  "./targets.ini",
+			Usage:  "Configuration file which contains the targets to check.",
+			EnvVar: "DNSBL_EXP_TARGETS",
 		},
 		cli.StringFlag{
-			Name:  "web.listen-address",
-			Value: ":9211",
-			Usage: "Address to listen on for web interface and telemetry.",
+			Name:   "web.listen-address",
+			Value:  ":9211",
+			Usage:  "Address to listen on for web interface and telemetry.",
+			EnvVar: "DNSBL_EXP_LISTEN",
 		},
 		cli.StringFlag{
 			Name:  "web.telemetry-path",