chore: Add CI and release-plz workflows adapted from c2pa-cbor

.commitlintrc.yml

@@ -0,0 +1,45 @@
+# If updating this file, please also review `docs/release-process.md`
+# (in the contentauth/c2pa-rs repo) and
+# `.github/workflows/pr_title.yml` and update the summary of these rules
+# in those files accordingly.
+
+rules:
+  # Body may be empty
+  body-empty:
+    level: ignore
+
+  # Description must not be empty
+  description-empty:
+    level: error
+
+  # Description should be <70 chars
+  description-max-length:
+    level: warning
+    length: 70
+
+  # Scope is not allowed
+  scope:
+    level: error
+    optional: false
+    options: []
+
+  # Subject line should exist
+  subject-empty:
+    level: error
+
+  # Type must be one of these options
+  type:
+    level: error
+    options:
+      - build
+      - chore
+      - ci
+      - docs
+      - feat
+      - fix
+      - perf
+      - refactor
+      - revert
+      - style
+      - test
+      - update

.github/PULL_REQUEST_TEMPLATE.md

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+## Changes in this pull request
+_Give a narrative description of what has been changed._
+
+## Checklist
+- [ ] This PR represents a single feature, fix, or change.
+- [ ] All applicable changes have been documented.
+- [ ] Any `TO DO` items (or similar) have been entered as GitHub issues and the link to that issue has been included in a comment.

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: "cargo"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    commit-message:
+      prefix: "update"
+    cooldown:
+      default-days: 7
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    commit-message:
+      prefix: "chore"
+    cooldown:
+      default-days: 7