Package arm64/arm/386 architectures too

During the CRT on-boarding, packaging for other Linux architectures (arm64,
arm, and 386) was not enabled. This change adds packaging support for those
architectures.

See #1132.
Related to hashicorp/releng-support#178.

These packages have not been tested on their respective platforms.  But given
we are already shipping binaries and docker images for them, I have high
confidence it'll Just Work. I still recommend testing them though :)!

To make future support a bit easier, I've enabled the build workflow from
releng prefixed branches.

.changelog/3428.txt

@@ -0,0 +1,3 @@
+```release-note:note
+build: Releases will now also be available as Debian and RPM packages for ARM64, ARM, and 386.
+```

.github/workflows/build.yml

@@ -10,6 +10,8 @@ on:
       - main
       # Push events to branches matching refs/heads/release/**
       - "release/**"
+      # Build on releng branches for testing build pipelines
+      - "releng/**"
 
 env:
   PKG_NAME: "consul-k8s"
@@ -171,7 +173,7 @@ jobs:
           path: ${{ matrix.component}}/out/${{ matrix.pkg_name }}_${{ needs.get-product-version.outputs.product-version }}${{ matrix.fips }}_${{ matrix.goos }}_${{ matrix.goarch }}.zip
 
       - name: Package rpm and deb files 
-        if: ${{ matrix.goos == 'linux' && matrix.component == 'cli' && matrix.goarch == 'amd64'}}
+        if: ${{ matrix.goos == 'linux' && matrix.component == 'cli' }}
         uses: hashicorp/actions-packaging-linux@v1
         with:
           name: consul-k8s${{ matrix.pkg_suffix }}
@@ -186,13 +188,13 @@ jobs:
           rpm_depends: "openssl"
 
       - name: Set package names
-        if: ${{ matrix.goos == 'linux' && matrix.component == 'cli' && matrix.goarch == 'amd64'}}
+        if: ${{ matrix.goos == 'linux' && matrix.component == 'cli' }}
         run: |
           echo "RPM_PACKAGE=$(basename out/*.rpm)" >> $GITHUB_ENV
           echo "DEB_PACKAGE=$(basename out/*.deb)" >> $GITHUB_ENV
 
       - name: Test rpm package
-        if: ${{ matrix.goos == 'linux' && matrix.component == 'cli' && matrix.goarch == 'amd64'}}
+        if: ${{ matrix.goos == 'linux' && matrix.component == 'cli' }}
         uses: addnab/docker-run-action@4f65fabd2431ebc8d299f8e5a018d79a769ae185 # v3
         with:
           image: registry.access.redhat.com/ubi9/ubi:latest
@@ -211,13 +213,13 @@ jobs:
 
       - name: Upload rpm package
         uses: actions/upload-artifact@0b7f8abb1508181956e8e162db84b466c27e18ce # v3.1.2
-        if: ${{ matrix.goos == 'linux' && matrix.component == 'cli' && matrix.goarch == 'amd64'}}
+        if: ${{ matrix.goos == 'linux' && matrix.component == 'cli' }}
         with:
           name: ${{ env.RPM_PACKAGE }}
           path: out/${{ env.RPM_PACKAGE }}
 
       - name: Test debian package
-        if: ${{ matrix.goos == 'linux' && matrix.component == 'cli' && matrix.goarch == 'amd64'}}
+        if: ${{ matrix.goos == 'linux' && matrix.component == 'cli' }}
         uses: addnab/docker-run-action@4f65fabd2431ebc8d299f8e5a018d79a769ae185 # v3
         with:
           image: ubuntu:latest
@@ -236,7 +238,7 @@ jobs:
 
       - name: Upload debian packages 
         uses: actions/upload-artifact@0b7f8abb1508181956e8e162db84b466c27e18ce # v3.1.2
-        if: ${{ matrix.goos == 'linux' && matrix.component == 'cli' && matrix.goarch == 'amd64'}}
+        if: ${{ matrix.goos == 'linux' && matrix.component == 'cli' }}
         with:
           name: ${{ env.DEB_PACKAGE }}
           path: out/${{ env.DEB_PACKAGE }}