set up woodpecker builds

also moves to buildx which should give us arm64 support as well

Author: nvdk

.woodpecker/feature.yml

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+steps:
+  build-feature:
+    image: woodpeckerci/plugin-docker-buildx
+    settings:
+      repo: ${CI_REPO/mu-semtech/semtech}
+      tags: ${CI_COMMIT_SOURCE_BRANCH/\//-}
+    secrets: [ docker_username, docker_password ]
+when:
+  branch: feature/*
+  event: push

.woodpecker/latest.yml

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+steps:
+  build-latest:
+    image: woodpeckerci/plugin-docker-buildx
+    settings:
+      repo: ${CI_REPO/mu-semtech/semtech}
+      tags: latest
+    secrets: [ docker_username, docker_password ]
+when:
+  branch: master
+  event: push

.woodpecker/release.yml

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+steps:
+  build-release:
+    image: woodpeckerci/plugin-docker-buildx
+    settings:
+      repo: ${CI_REPO/mu-semtech/semtech}
+      tags: "${CI_COMMIT_TAG##v}"
+    secrets: [ docker_username, docker_password ]
+when:
+  event: tag
+  tag: v*