Add GitHub workflow for integration tests

Signed-off-by: Mihaela Balutoiu <mbalutoiu@cloudbasesolutions.com>

.github/workflows/integration-tests.yml

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+name: Integration Tests
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  integration-tests:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Setup Golang
+        uses: actions/setup-go@v3
+        with:
+          go-version-file: go.mod
+
+      - name: Setup LXD
+        uses: canonical/setup-lxd@v0.1.1
+
+      - name: Build GARM
+        run: make build
+
+      - name: Setup GARM
+        run: sudo --preserve-env ./test/integration/scripts/setup-garm.sh
+        env:
+          GH_OAUTH_TOKEN: ${{ secrets.GH_OAUTH_TOKEN }}
+          CREDENTIALS_NAME: test-garm-creds
+
+      - name: Run integration tests
+        run: go run ./test/integration/e2e.go
+        env:
+          GARM_BASE_URL: http://127.0.0.1:9997
+          GARM_USERNAME: admin
+          GARM_PASSWORD: ${{ secrets.GARM_ADMIN_PASSWORD }}
+          GARM_FULLNAME: Local GARM Admin
+          GARM_EMAIL: admin@example.com
+          GARM_NAME: local_garm
+          CREDENTIALS_NAME: test-garm-creds
+          REPO_WEBHOOK_SECRET: ${{ secrets.REPO_WEBHOOK_SECRET }}
+          ORG_WEBHOOK_SECRET: ${{ secrets.ORG_WEBHOOK_SECRET }}
+
+      - name: Show GARM logs
+        if: always()
+        run: |
+          sudo systemctl status garm
+          sudo journalctl -u garm --no-pager

test/integration/config/config.toml

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+[default]
+callback_url = "http://${GARM_METADATA_IP}:9997/api/v1/callbacks/status"
+metadata_url = "http://${GARM_METADATA_IP}:9997/api/v1/metadata"
+
+[metrics]
+enable = true
+disable_auth = false
+
+[jwt_auth]
+secret = "${JWT_AUTH_SECRET}"
+time_to_live = "8760h"
+
+[apiserver]
+bind = "0.0.0.0"
+port = 9997
+use_tls = false
+
+[database]
+backend = "sqlite3"
+passphrase = "${DB_PASSPHRASE}"
+[database.sqlite3]
+  db_file = "/etc/garm/garm.db"
+
+[[provider]]
+name = "lxd_local"
+provider_type = "lxd"
+description = "Local LXD installation"
+[provider.lxd]
+  unix_socket_path = "/var/snap/lxd/common/lxd/unix.socket"
+  include_default_profile = false
+  instance_type = "container"
+  secure_boot = false
+  project_name = "default"
+  [provider.lxd.image_remotes]
+    [provider.lxd.image_remotes.ubuntu]
+        addr = "https://cloud-images.ubuntu.com/releases"
+        public = true
+        protocol = "simplestreams"
+        skip_verify = false
+    [provider.lxd.image_remotes.ubuntu_daily]
+        addr = "https://cloud-images.ubuntu.com/daily"
+        public = true
+        protocol = "simplestreams"
+        skip_verify = false
+    [provider.lxd.image_remotes.images]
+        addr = "https://images.linuxcontainers.org"
+        public = true
+        protocol = "simplestreams"
+        skip_verify = false
+
+[[github]]
+name = "${CREDENTIALS_NAME}"
+description = "GARM GitHub OAuth token"
+oauth2_token = "${GH_OAUTH_TOKEN}"
+
+[[github]]
+name = "${CREDENTIALS_NAME}-clone"
+description = "GARM GitHub OAuth token - clone"
+oauth2_token = "${GH_OAUTH_TOKEN}"